remote, #528: Improved way of listing URLs

+ Instead of using `git remote show` that may triggers connection to
remote repo, use `git remote get-url --all` that works by only
reading the `.git/config`.
+ Change should have no functional impact, so no test needed.
+ Works only with git -2.7+.

Signed-off-by: Guyzmo <guyzmo+github@m0g.net>

Author: guyzmo

git/remote.py

@@ -496,10 +496,9 @@ def delete_url(self, url, **kwargs):
     def urls(self):
         """:return: Iterator yielding all configured URL targets on a remote
         as strings"""
-        remote_details = self.repo.git.remote("show", self.name)
+        remote_details = self.repo.git.remote("get-url", "--all", self.name)
         for line in remote_details.split('\n'):
-            if '  Push  URL:' in line:
-                yield line.split(': ')[-1]
+            yield line
 
     @property
     def refs(self):