Move info messages to debug level

:Release Notes:
Info level is used for logging only metrics information.
Hence moving developer useful messages from notice and
info to debug level.

:Detailed Notes:

:Testing Performed:
Compiled and verified mainstream logs in /var/log/messages

:QA Notes:

:Issues Addressed:
[GF-41248] Activitymanager logging debug messages at info level

Open-webOS-DCO-1.0-Signed-off-by: Gayathri Srinivasan <gayathri.srinivasan@lge.com>

Change-Id: Ia2d709f7109cf34e8c2a19e17893b5df8382a496
Reviewed-on: https://g2g.palm.com/3616
Reviewed-by: Build Verification
Reviewed-by: Gayathri Srinivasan <gayathri.srinivasan@lge.com>
Tested-by: Gayathri Srinivasan <gayathri.srinivasan@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>