Before this change only last namespace in full path was extracted. It's
fine unless you have a link to submodule under subgroups. In that case
self_url? method returns false and link is processed as external. I
could not find a proper regex to cover all cases and correctly extract
full path to repository and instead used current instance host name
to get correct path to namespace and project.
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>