logger: Prevent output of verbose messages initiated from rasterisk.

Remote asterisk consoles should only display verbose log messages
created by the daemon.  The first patch for ASTERISK-26410 caused
a couple verbose messages to be printed when the rasterisk process
ended.

ASTERISK-26410

Change-Id: Ie2a1bb3753ad2724c0349ec1a336f52f7117b52a