use ByteString for git config

The parser and looking up config keys in the map should both be faster
due to using ByteString.

I had hoped this would speed up startup time, but any improvement to
that was too small to measure. Seems worth keeping though.

Note that the parser breaks up the ByteString, but a config map ends up
pointing to the config as read, which is retained in memory until every
value from it is no longer used. This can change memory usage
patterns marginally, but won't affect git-annex.

Annex/UUID.hs

@@ -11,6 +11,8 @@
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
+{-# LANGUAGE OverloadedStrings #-}
+
 module Annex.UUID (
 	getUUID,
 	getRepoUUID,
@@ -112,7 +114,7 @@ storeUUIDIn configfield = setConfig configfield . fromUUID
 {- Only sets the configkey in the Repo; does not change .git/config -}
 setUUID :: Git.Repo -> UUID -> IO Git.Repo
 setUUID r u = do
-	let s = show configkey ++ "=" ++ fromUUID u
+	let s = encodeBS' $ show configkey ++ "=" ++ fromUUID u
 	Git.Config.store s r
 
 -- Dummy uuid for the whole web. Do not alter.