[stable-2.9] Remove obsolete MANIFEST.in entries.

(cherry picked from commit 7d40f6d)

Co-authored-by: Matt Clay <matt@mystile.com>

MANIFEST.in

@@ -20,13 +20,11 @@ recursive-include lib/ansible/config *.yml
 recursive-include licenses *.txt
 recursive-include packaging *
 recursive-include test/ansible_test *.py Makefile
-recursive-include test/cache .keep
 recursive-include test/integration *
 recursive-include test/lib/ansible_test/config *.template
 recursive-include test/lib/ansible_test/_data *.cfg *.ini *.json *.ps1 *.psd1 *.py *.sh *.txt *.yml coveragerc inventory
 recursive-include test/lib/ansible_test/_data/injector ansible ansible-config ansible-connection ansible-console ansible-doc ansible-galaxy ansible-playbook ansible-pull ansible-test ansible-vault pytest
 recursive-include test/lib/ansible_test/_data/sanity/validate-modules validate-modules
-recursive-include test/results .keep
 recursive-include test/sanity *.json *.py *.txt
 exclude test/sanity/code-smell/botmeta.*
 recursive-include test/units *