Initial commit of mock 2.0.0

Added in:
- METADATA
- Android.bp
- NOTICE
- MODULE_LICENSE_BSD

Modified mock.py to not depend on pbr module, pbr was just used for
versioning and since mock has not been modified in months (last commit
was Jan 2018) I just hardcoded the version into mock.py instead.

Merge commit '8c19ef6c' into import

Bug: 112163440
Test: Built acloud-test with py-mock and was able to run successfully

Change-Id: Iec384477c863178730f6e42cf67044eb80ec0ce1