Adds "/var/log/messages" to hourly log rotation

Because still many services, including MongoDB, are logging to standard log
destination we should rotate the logs more agressively. Moreover MongoDB in
version 2.4 cannot use LogFacility, so it's easier to fix it in logrotate than
in MonngoDB module itself.

Change-Id: Ice1bbf4a3bf2d453a41d7660b8742a074ec29216
Closes-Bug: 1367234
(cherry picked from commit f686e9ea00eaa9ae141e283ff2b8b28bacd89f72)