Move sdkextensions test to the SdkExtensions repo

Having them in a separate repository is a bit inconvenient. They fit
better together with the module itself.

Test: presubmit
Exempt-From-Owner-Approval: cp
Change-Id: I4221f975b72920c2a287b3aae346951e2658d0f2
Merged-In: I4221f975b72920c2a287b3aae346951e2658d0f2
(cherry picked from commit de2ea7bd83b25103a387ee91d36c0c1df9765d69)
5 files changed