Improve startup time for commands that do not operate on remotes

And for tab completion, by not unnessessarily statting paths to remotes,
which used to cause eg, spin-up of removable drives.

Got rid of the remotes member of Git.Repo. This was a bit painful.

Remote.Git modifies the list of remotes as it reads their configs,
so still need a persistent list of remotes. So, put it in as
Annex.gitremotes. It's only populated by getGitRemotes, so commands
like examinekey that don't care about remotes won't do so.

This commit was sponsored by Jake Vosloo on Patreon.

Annex/Branch.hs

@@ -60,7 +60,6 @@ import Logs.Transitions
 import Logs.File
 import Logs.Trust.Pure
 import Logs.Difference.Pure
-import Annex.ReplaceFile
 import qualified Annex.Queue
 import Annex.Branch.Transitions
 import qualified Annex

Annex/Content/Direct.hs

@@ -32,7 +32,6 @@ module Annex.Content.Direct (
 import Annex.Common
 import Annex.Perms
 import qualified Git
-import Utility.Tmp
 import Logs.Location
 import Logs.File
 import Utility.InodeCache

Annex/Fixup.hs

@@ -10,7 +10,6 @@ module Annex.Fixup where
 import Git.Types
 import Git.Config
 import Types.GitConfig
-import qualified Git.Construct as Construct
 import qualified Git.BuildVersion
 import Utility.Path
 import Utility.SafeCommand
@@ -30,7 +29,7 @@ fixupRepo r c = do
 	let r' = disableWildcardExpansion r
 	r'' <- fixupSubmodule r' c
 	if annexDirect c
-		then fixupDirect r''
+		then return (fixupDirect r'')
 		else return r''
 
 {- Disable git's built-in wildcard expansion, which is not wanted
@@ -44,19 +43,16 @@ disableWildcardExpansion r
 {- Direct mode repos have core.bare=true, but are not really bare.
  - Fix up the Repo to be a non-bare repo, and arrange for git commands
  - run by git-annex to be passed parameters that override this setting. -}
-fixupDirect :: Repo -> IO Repo
+fixupDirect :: Repo -> Repo
 fixupDirect r@(Repo { location = l@(Local { gitdir = d, worktree = Nothing }) }) = do
-	let r' = r
+	r
 		{ location = l { worktree = Just (parentDir d) }
 		, gitGlobalOpts = gitGlobalOpts r ++
 			[ Param "-c"
 			, Param $ coreBare ++ "=" ++ boolConfig False
 			]
 		}
-	-- Recalc now that the worktree is correct.
-	rs' <- Construct.fromRemotes r'
-	return $ r' { remotes = rs' }
-fixupDirect r = return r
+fixupDirect r = r
 
 {- Submodules have their gitdir containing ".git/modules/", and
  - have core.worktree set, and also have a .git file in the top