Support build python3.x version in openSUSE

Support build python3.x version in openSUSE
writing "PBR_VERSION=X.Y.Z" to fix build error:
Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository.
It's also possible that there is a mismatch between the package name in setup.cfg and the argument given to
pbr.version.VersionInfo. Project name jenkinsapi was given, but was not able to be found

Change-Id: Ifbabf252febcdabd1d35f384da528730399ae45f
Signed-off-by: biao716.wang <biao716.wang@samsung.com>