rpm: support importing bzip2 compressed patches

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
import-srpm: support --upstream-vcs-tag cmdline option

Similar to what the option does in git-import-orig-[rpm].

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>