Add logics to upload to local testing server

:Release Notes:
Add logics to upload to local testing server

:Detailed Notes:
When PARSE_DEFAULT_ONLY is specified,
only default.conf will be parsed for context definitions.
Add function for checking the file exists.

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

:QA Notes:

:Issues Addressed:
[GF-43571] Upload crash and analytics report to a test server

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

Change-Id: I8e4918916a28763dd017babf3f7adc70f91f6c5e
Reviewed-on: https://g2g.palm.com/3780
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>