Add gflags.py
Add gflags.py

This is a temporary hack to allow cros_mark_as_stable to work outside
the chroot. Eventually, we'll re-write the code to use optparse.

BUG=5412
TEST=Verified the cros_mark_as_stable now works outside the chroot.

Change-Id: Ife1f7aeadb70ba004d3928a9c71d6e95c042833d

Review URL: http://codereview.chromium.org/3037046

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