Fix script to include repos in PYTHONPATH

The repos checkout needs to be in the PYTHONPATH for the
import of the xstatic module to work. Since we invoke
the xstatic_check_version.py by absolute path, Python
does not include the cwd() in the PYTHONPATH.

Change-Id: Idd4f8db6334c9f29168e3bc39de3ed95a4e1c60f

jenkins/scripts/xstatic_check_version.py

@@ -18,6 +18,10 @@ import sys
 
 from setuptools_scm import get_version
 
+# add the xstatic repos checkout to the PYTHONPATH so we can
+# import its contents
+sys.path.append(os.getcwd())
+
 xs = None
 for name in os.listdir('xstatic/pkg'):
     if os.path.isdir('xstatic/pkg/' + name):