buildhistory: Measure time needed for git status and git push

:Release Notes:
buildhistory checkout is huge, git status can take significant time.
This commit is to check if it's true for our builders.

:Detailed Notes:

:Testing Performed:
Only build tested.

:QA Notes:
No change in image.

:Issues Addressed:
[ES-271] Measure where time is going in our various OE builds

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: If42edfb73bbf6ab4c6ee7f9c36f20ab07bf0aa9c
Reviewed-on: https://g2g.palm.com/3635
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>