Moderate: systemd security and bug fix update (Oracle Linux 7)

[219-30.0.1.3]
- set 'RemoveIPC=no' in logind.conf as default for OL7.2 [22224874]
- allow dm remove ioctl to co-operate with UEK3 (Vaughan Cao) [Orabug: 18467469]
- add hv dynamic memory support (Jerry Snitselaar) [Orabug: 18621475]
- rules: load sg module (#1223340)
- run: drop mistakenly committed test code (#1220272)
- cgroup: downgrade log messages when we cannot write to cgroup trees that are mounted read-only (#1220298)
- Revert 'conditionalize hardening away on s390(x)'
- Revert 'units: fix BindsTo= logic when applied relative to services with Type=oneshot' (#1203803)
- shared/install: avoid prematurely rejecting 'missing' units (#1199981)
- core: fix enabling units via their absolute paths (#1199981)

[219-30.3]
- mtd_probe: add include for stdint (#1381573)

[219-30.2]
- manager: 219 needs u->id in log_unit_debug (#1381573)

[219-30.1]
- If the notification message length is 0, ignore the message (#4237) (#1381573)
- systemctl: suppress errors with 'show' for nonexistent units and properties (#1380686)
- 40-redhat.rules: disable auto-online of hot-plugged memory on IBM z Systems (#1381123)
- pid1: don't return any error in manager_dispatch_notify_fd() (#4240) (#1381573)
- pid1: process zero-length notification messages again (#1381573)
- pid1: more informative error message for ignored notifications (#1381573)

[219-30]
- systemctl,pid1: do not warn about missing install info with 'preset' (#1373950)
- systemctl/core: ignore masked units in preset-all (#1375097)
- shared/install: handle dangling aliases as an explicit case, report nicely (#1375097)
- shared/install: ignore unit symlinks when doing preset-all (#1375097)
- 40-redhat.rules: don't hoplug memory on s390x (#1370161)

[219-29]
- fix gcc warnings about uninitialized variables (#1318994)
- journalctl: rework code that checks whether we have access to /var/log/journal (#1318994)
- journalctl: Improve boot ID lookup (#1318994)
- journalctl: only have a single exit path from main() (#1318994)
- journalctl: free all command line argument objects (#1318994)
- journalctl: rename boot_id_t to BootId (#1318994)
- util: introduce CMSG_FOREACH() macro and make use of it everywhere (#1318994)
- journald: don't employ inner loop for reading from incoming sockets (#1318994)
- journald: fix count of object meta fields (#1318994)
- journal-cat: return a correct error, not -1 (#1318994)
- journalctl: introduce short options for --since and --until (#1318994)
- journal: s/Envalid/Invalid/ (#1318994)
- journald: dispatch SIGTERM/SIGINT with a low priority (#1318994)
- lz4: fix size check which had no chance of working on big-endian (#1318994)
- journal: normalize priority of logging sources (#1318994)
- Fix miscalculated buffer size and uses of size-unlimited sprintf() function. (#1318994)
- journal: Drop monotonicity check when appending to journal file (#1318994)
- journalctl: unify how we free boot id lists a bit (#1318994)
- journalctl: don't trust the per-field entry tables when looking for boot IDs (#1318994)
- units: remove udev control socket when systemd stops the socket unit (#49) (#1370133)
- logind: don't assert if the slice is missing (#1371437)
- core: enable transient unit support for slice units (#1370299)
- sd-bus: bump message queue size (#1371205)
- install: fix disable when /etc/systemd/system is a symlink (#1285996)
- rules: add NVMe rules (#3136) (#1274651)
- rules: introduce disk/by-id (model_serial) symlinks for NVMe drives (#3974) (#1274651)
- rules: fix for possible whitespace in the 'model' attribute (#1274651)

[219-27]
- tmpfiles: enforce ordering when executing lines (#1365870)
- Introduce bus_unit_check_load_state() helper (#1256858)
- core: use bus_unit_check_load_state() in transaction_add_job_and_dependencies() (#1256858)
- udev/path_id: correct segmentation fault due to missing NULL check (#1365556)
- rules: load sg driver also when scsi_target appears (#45) (#1322773)

[219-26]
- install: do not crash when processing empty (masked) unit file (#1159308)
- Revert 'install: fix disable via unit file path' (#1348208)
- systemctl: allow disable on the unit file path, but warn about it (#3806) (#1348208)

[219-25]
- units: increase watchdog timeout to 3min for all our services (#1267707)
- core: bump net.unix.max_dgram_qlen really early during boot (#1267707)
- core: fix priority ordering in notify-handling (#1267707)
- tests: fix personality tests on ppc64 and aarch64 (#1361049)
- systemctl: consider service running only when it is in active or reloading state (#3874) (#1362461)

[219-24]
- manager: don't skip sigchld handler for main and control pid for services (#3738) (#1342173)

[219-23]
- udevadm: explicitly relabel /etc/udev/hwdb.bin after rename (#1350756)
- systemctl: return diffrent error code if service exist or not (#3385) (#1047466)
- systemctl: Replace init script error codes with enum (#3400) (#1047466)
- systemctl: rework 'systemctl status' a bit (#1047466)
- journal-verify: don't hit SIGFPE when determining progress (#1350232)
- journal: avoid mapping empty data and field hash tables (#1350232)
- journal: when verifying journal files, handle empty ones nicely (#1350232)
- journal: explain the error when we find a non-DATA object that is compressed (#1350232)
- journalctl: properly detect empty journal files (#1350232)
- journal: uppercase first character in verify error messages (#1350232)
- journalctl: make sure 'journalctl -f -t unmatched' blocks (#1350232)
- journalctl: don't print -- No entries -- in quiet mode (#1350232)
- sd-event: expose the event loop iteration counter via sd_event_get_iteration() (#1342173)
- manager: Only invoke a single sigchld per unit within a cleanup cycle (#1342173)
- manager: Fixing a debug printf formatting mistake (#1342173)
- core: support IEC suffixes for RLIMIT stuff (#1351415)
- core: accept time units for time-based resource limits (#1351415)
- time-util: add parse_time(), which is like parse_sec() but allows specification of default time unit if none