fix "repo sync" error when inited with user@host:port

example
repo init -u git@192.168.2.34:hd/mxivi/manifests.git
repo sync
sync will fail becasue url is wrong and got
Access denied

manifest_xml.py

@@ -94,8 +94,11 @@ class _XmlRemote(object):
     # and then replacing it with the original when we are done.
 
     if manifestUrl.find(':') != manifestUrl.find('/') - 1:
+      if url.find(':') != url.find('/') - 1:
+        url = 'gopher://' + url
       url = urllib.parse.urljoin('gopher://' + manifestUrl, url)
       url = re.sub(r'^gopher://', '', url)
+
     else:
       url = urllib.parse.urljoin(manifestUrl, url)
     return url