Support branch option in unit-test script

Building on the support of the branch option within the
docker container, add it to unit-test for any dependent
repositories that do not get built into the docker
container

Testing:
- Verified with no branch input, worked as expected
- Verified with invalid branch, master was still used

Change-Id: I4f57d6165287ffe3b4e2f0377292128474199ca3
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
2 files changed