Disallow editHashtags in acl configs

Since this is set system-wide, and we want to promote consistency,
remove them from the available set of options.

Change-Id: I3b367f51b0771958a975b873c9e2778bcdf55a20

tools/normalize_acl.py

@@ -162,7 +162,6 @@ valid_keys = {
     'defaultValue',
     'delete',
     'description',
-    'editHashtags',
     'exclusiveGroupPermissions',
     'forgeAuthor',
     'forgeCommitter',
@@ -195,7 +194,6 @@ group_keys = {
     'create',
     'createSignedTag',
     'delete',
-    'editHashtags',
     'forgeCommitter',
     'pushMerge',
     'submit',