factor out more ssh stuff from git remote

This has the dual benefits of making Remote.Git shorter, and letting
Remote.GCrypt use these utilities.

Remote/Helper/Messages.hs

@@ -0,0 +1,17 @@
+{- git-annex remote messages
+ -
+ - Copyright 2013 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Remote.Helper.Messages where
+
+import Common.Annex
+import qualified Git
+
+showChecking :: Git.Repo -> Annex ()
+showChecking r = showAction $ "checking " ++ Git.repoDescribe r
+
+cantCheck :: Git.Repo -> Either String Bool
+cantCheck r = Left $ "unable to check " ++ Git.repoDescribe r