move the rsyslogd restart

it's not clear why swift start is the place where an rsyslogd start
is happening, we should really only make this change when we actually
change a file on disk.

Also, use rsyslogd's -HUP signal directly instead of the system init
scripts which are typically doing a stop and start, and apparently
racing under some circumstances.

Change-Id: I1b9891313d67b1da2ca2582e532b2536a81f9b25
Closes-Bug: #1262906
Merge "move the rsyslogd restart"