puppetmaster: restart apache2 once on logrotate

logrotate right now as missing the "sharedscripts" option, which meant
that Apache was gracefully restarted once per each logfile (i.e. 7 times
on palladium) in succession, very quickly. This may have had something
to do with mod_passenger/puppetmaster failures that were logged at the
time and is nevertheless an important omission. (while at it, also add
delaycompress)

Change-Id: I10fd2fc699c3a3ca15188a3c88563fccca0b4a53