Add missing os.path.abspath around csrfile.

We need to make sure paths are absolute before passing them to openssl.

Fixes bug 1185052

Change-Id: I3ba9dd0a01d0078f830c33ac3173259985790060
Merge "Add missing os.path.abspath around csrfile."
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp