ci: helm integration test is failing on pre-k8s-1.16
ci: helm integration test is failing on pre-k8s-1.16

testCephHelmSuite is failing in pre-k8s v1.16
due to invalid schema. v1beta1 doesn't support
null value so returning quotes instead of an empty
string.

Signed-off-by: subhamkrai <bb6131f7fb4bb2a9ce18c6dfefd4c517b6b3ce6a@redhat.com>

rook/nfs,rook/rook,rook/nfs,rook/nfs,rook/rook,rook/rook,rook/rook,rook/rook