Change level to info for global context

:Release Notes:
Change level to info for global context

:Detailed Notes:
This is a timing problem to initialize the global context's log level.
That's why the situation can not be reproduced well.
When the module which is first one to use pmloglib's function
while system is booting, global context's level will be initialized with
"debug". This logic is being protected by lock mechanism. After then,
"PmLogPrvReadConfigs(parse_json_file)" function will be called to set log
level to "info" due to parsing the default.conf.
It'll set to debug level if the second module try to use pmloglib's function
at just before first module calling "PmLogPrvReadConfigs(parse_json_file)".
At this point global context log level is not changed to "info" yet.
As a result, the second module's log level will be set to "debug".
So, I have changed log level for global context as "Info".

:Testing Performed:
Compiled locally and tested on a device.

:QA Notes:

:Issues Addressed:
[GF-52078] gm.winmain is logging debug messages at info level

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

Change-Id: Ic98112ec0f3d2509533449667121ba997fdf4cd8
Reviewed-on: https://g2g.palm.com/4114
Reviewed-by: DCO 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>