Added rsyslog restart handlers to each rsyslog_server_post_install task.
There was an issue when rsyslog_post_install would stop its service,
it would automatically get restarted and the service would not listen
for incoming logs. This now ensures that the rsyslog service will
be restarted after configuration files are changed.
Add rsyslog_pid_name to variable files for distrubition changes for rsyslogd pid
Change-Id: I757387e8f7f7209b1ab928208894ecf4bf510efc
Partial-Bug: 1636017