Adding set_url and list_urls methods to Remote

Both commands enable handling of a little known feature
of git, which is to support multiple URL for one remote.
You can add multiple url using the `set_url` subcommand of
`git remote`. Though listing them is also handy, so there's
a nice method to do it, using the configuration.

Signed-off-by: Guyzmo <[email protected]>

Author: guyzmo

Diff for: git/remote.py

@@ -434,6 +434,21 @@ def iter_items(cls, repo):
             yield Remote(repo, section[lbound + 1:rbound])
         # END for each configuration section
 
+    def set_url(self, url, **kwargs): # pragma: no cover
+        '''Configure a new url on current remote (cf command git remote set_url'''
+        scmd = 'set-url'
+        kwargs['insert_kwargs_after'] = scmd
+        self.repo.git.remote(scmd, self.name, url, **kwargs)
+        return self
+
+    @property
+    def list_urls(self): # pragma: no cover
+        '''Return the list of all configured URL targets'''
+        remote_details = self.repo.git.remote("show", self.name)
+        for line in remote_details.split('\n'):
+            if '  Push  URL:' in line:
+                yield line.split(': ')[-1]
+
     @property
     def refs(self):
         """