Add ls2 method to provide force rotate mainstream

:Release Notes:
There are Two ls2 methods have been added.

:Detailed Notes:
First method will return pmlogdaemon's APP_ID that will be appeard
as "com.palm.pmlogd".
Second method will do force rotation to mainstream that is
"/var/log/messages".

:Testing Performed:
Compiled locally and tested on locally.
Verified in the location for /var/log and properly compressed the
mainstream file when it had given the command below.

:QA Notes:
- force rotating
  luna-send -n 1 luna://com.webos.pmlogd/forcerotate '{}'
  {"returnValue":true}
  {"returnValue":false,"errorText":"Log rotation failed"}

:Issues Addressed:
[GF-7725] pmlogdaemon: Add ls2 method in pmlogdaemon to force
log rotate and upload

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

Change-Id: I75a84fe998d2a0d682abfb837f9cbe8d162e2760
Reviewed-on: https://g2g.palm.com/2981
Reviewed-by: Build Verification
Reviewed-by: Hongjeon Ha <hj.ha@lge.com>
Tested-by: Hongjeon Ha <hj.ha@lge.com>
Reviewed-by: Gayathri Srinivasan <gayathri.srinivasan@lge.com>