core: AuditLogDirector.log(*) methods now update engine.log

Every event that appears in the admin console's event viewer is now
logged permanently to the log file for posterity.

Change-Id: I006229291b9a265d7fc6e1d822d2c64b2839aaff
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=966192
Signed-off-by: Spenser Shumaker <sshumake@redhat.com>