UPSTREAM: 95009: Remove ext2 + ext3 tests
UPSTREAM: 95009: Remove ext2 + ext3 tests

Testing with the default FS (ext4) is IMO enough, ext2/ext3 does not add much
value. It's handled by the same kernel module anyway.

Leave ext2/ext3 only in GCE PD which is tested in kubernetes/kubernetes CI
jobs regularly to catch regressions.

ravisantoshgudimetla/kubernetes,ravisantoshgudimetla/kubernetes,csrwng/kubernetes,openshift/kubernetes,ravisantoshgudimetla/kubernetes,bparees/kubernetes,openshift/kubernetes,bparees/kubernetes,bparees/kubernetes,csrwng/kubernetes,csrwng/kubernetes,bparees/kubernetes,csrwng/kubernetes,ravisantoshgudimetla/kubernetes,csrwng/kubernetes,ravisantoshgudimetla/kubernetes,openshift/kubernetes,openshift/kubernetes,bparees/kubernetes,ravisantoshgudimetla/kubernetes,openshift/kubernetes