Skip git_repo testing

Skip git_repo testing

As discussed in Kind [1], this test is for the deprecated in-tree GitRepo volume type.
"we shouldn't expend resources on these volume types".

[1] https://github.com/kubernetes-sigs/kind/issues/2356
[2] https://build.opnfv.org/ci/job/functest-kubernetes-opnfv-functest-kubernetes-smoke-latest-sig_storage_serial-run/16/console

Change-Id: I9951f49208376652e8d580b3086f72994424cf80
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
(cherry picked from commit 89dfd5adb8a1e4ac8a1278e421ef7fd90847c65e)