move license directory out of docs

Signed-off-by: Hao Liu <haoli@redhat.com>

MANIFEST.in

@@ -12,7 +12,7 @@ recursive-include awx/plugins *.ps1
 recursive-include requirements *.txt
 recursive-include requirements *.yml
 recursive-include config *
-recursive-include docs/licenses *
+recursive-include licenses *
 recursive-exclude awx devonly.py*
 recursive-exclude awx/api/tests *
 recursive-exclude awx/main/tests *