Change in swift-drive-audit handling log rotation.

Change supports kern.log rotation in order to avoid loss
of significant information.

There is a year change functionality added as kern.log
does not keep record of year.

There is also backwards function added which allows
reading logs from the back to the front, speeding up the
execution along with the unit test for it

Fixes Bug 1080682

Change-Id: I93436c405aff5625396514000cab774b66022dd0
Merge "Change in swift-drive-audit handling log rotation."