* Install haproxy-logging.cfg numerically before Ubuntu's
/etc/rsyslog.d/49-haproxy.conf so its logging directives see HAProxy
logs before they are discarded by 49-haproxy.conf.
* Set owner of /var/log/haproxy to rsyslog's `syslog` user so rsyslog
can write to it on Ubuntu.
* Limit HAProxy-related rsyslog processing to HAProxy log messages
instead of any/all log messages with the local0 or local1 facility
and assuming HAProxy is the only application using those facilities.
Change-Id: Ic259abc281619ba5ee8f020ac68373858a06e94d
Closes-Bug: #1783886