guestfs: set group flag for functional tests
guestfs: set group flag for functional tests

For certain cases not setting the fsGroup in the security context can
lead to an unwritable PVC when the pod is running with uid !=0.
Always set it during the functional tests.

Signed-off-by: Alice Frosi <93920af21f2e5725c81babb78c15f887c6026b77@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt