Update the username when authenticating user

If the user with e-mail exists update his username.

Signed-off-by: Michal Konecny <[email protected]>

anitya/auth.py

@@ -84,6 +84,10 @@ def auth(name):  # pragma: no cover
             Session.add(new_user)
             Session.commit()
             user = new_user
+        elif user.username != user_info["username"]:
+            user.username = user_info["username"]
+            Session.add(user)
+            Session.commit()
         _log.debug("Logging as user %s", user.email)
         flask_login.login_user(user)