Remove the AUDIT log message about loaded ext

Finally, I got to a boiling point when having to scroll through endless
and pointless log.AUDIT messages about "Loading extension XXX" in the
startup messages for the os-api endpoints. This patch gets rid of this
extreme annoyance.

Change-Id: Ia47f6afae89d145ade2a940d4720f5977fde2204
Merge "Remove the AUDIT log message about loaded ext"