recipetool: handle GitLab URLs like we do GitHub

GitHub URLs are automatically transformed to git: fetches, so handle
GitLab URLs too.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 651fb951)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>