httppasswordmgrdbproxy: specify exact arguments

We only ever call these functions in a single way, so let's just
actually specify them. We need to do some string/bytes encoding
dancing here for Python 3, so it'll help to know what arguments we
need to convert.

# no-check-commit because I'm modifying functions that check-commit
does not like.

Differential Revision: https://phab.mercurial-scm.org/D885

mercurial/ui.py

@@ -146,11 +146,11 class httppasswordmgrdbproxy(object):
             self._mgr = urlreq.httppasswordmgrwithdefaultrealm()
         return self._mgr
 
-    def add_password(self, *args, **kwargs):
-        return self._get_mgr().add_password(*args, **kwargs)
+    def add_password(self, realm, uris, user, passwd):
+        return self._get_mgr().add_password(realm, uris, user, passwd)
 
-    def find_user_password(self, *args, **kwargs):
-        return self._get_mgr().find_user_password(*args, **kwargs)
+    def find_user_password(self, realm, uri):
+        return self._get_mgr().find_user_password(realm, uri)
 
 def _catchterm(*args):
     raise error.SignalInterrupt