Merge branch 'nd/worktree-move'

"git worktree" learned move and remove subcommands.

* nd/worktree-move:
  t2028: fix minor error and issues in newly-added "worktree move" tests
  worktree remove: allow it when $GIT_WORK_TREE is already gone
  worktree remove: new command
  worktree move: refuse to move worktrees with submodules
  worktree move: accept destination as directory
  worktree move: new command
  worktree.c: add update_worktree_location()
  worktree.c: add validate_worktree()

contrib/completion/git-completion.bash

@@ -3087,7 +3087,7 @@ _git_whatchanged ()
 
 _git_worktree ()
 {
-	local subcommands="add list lock prune unlock"
+	local subcommands="add list lock move prune remove unlock"
 	local subcommand="$(__git_find_on_cmdline "$subcommands")"
 	if [ -z "$subcommand" ]; then
 		__gitcomp "$subcommands"
@@ -3105,6 +3105,9 @@ _git_worktree ()
 		prune,--*)
 			__gitcomp "--dry-run --expire --verbose"
 			;;
+		remove,--*)
+			__gitcomp "--force"
+			;;
 		*)
 			;;
 		esac