Low: stonith: external/vcenter: Disable SSL hostname verification by default (bnc#851990)

Add parameter to the agent to enable or disable SSL hostname verification, and
set the default to 0.
Medium: hb_report: Add support for xz compression (bnc#854060)

On some systems, log files are compressed with xz compression.
Assumes that xz is installed if logs are compressed with xz.
logd: Add systemd unit file for logd (bnc#863248)

Adds a systemd service script for logd, to replace the
old SysVInit script.