Recommended update for salt

This update for Salt fixes one security issue and several non-security issues.

The following security issue has been fixed:

- Fix possible information leak due to revoked keys still being used. (bsc#1012398, CVE-2016-9639)

The following non-security issues have been fixed:

- Update to 2015.8.12
- Add pre-require to salt for minions.
- Do not restart salt-minion in salt package.
- Add try-restart to sys-v init scripts.
- Add 'Restart=on-failure' for salt-minion systemd service.
- Re-introduce 'KillMode=process' for salt-minion systemd service.
- Successfully exit of salt-api child processes when SIGTERM is received.
- Fix exit codes of sysv init script. (bsc#999852)
- Include resolution parameters in the Zypper debug-solver call during a dry-run dist-upgrade.
- Fix Salt API crash via salt-ssh on empty roster. (bsc#1004723)
- Add 'dist-upgrade' support to zypper module. (fate#320559)
- Fix position of -X option to setfacl. (bsc#1004260)
- Fix generated shebang in scripts on SLES-ES 7. (bsc#1004047)
- Fix changing default-timezone. (bsc#1008933)