Filter non-PmLogLib messages to alternative context

Messages from PmLogLib are prefixed with "[pmlog] ". All
other messages are sent to an alternative context.

[GF-6604] pmlogdaemon: Redirect output from non-pmloglib ...

Open-webOS-DCO-1.0-Signed-off-by: Hongjeon Ha <hj.ha@lge.com>

Change-Id: Ic4a3dd92d4d5b301d9215742c1864290c4e77c9a
Reviewed-on: https://g2g.palm.com/2549
Reviewed-by: Build Verification
Reviewed-by: Hongjeon Ha <hj.ha@lge.com>
Tested-by: Hongjeon Ha <hj.ha@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Tested-by: Keith Derrick <keith.derrick@lge.com>