andyzhangx: test: enable fsGroup external test for nfs

JobBuild
820
03-07 11:37
unknown
03-07 11:36
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pull-azurefile-csi-driver-external-e2e-nfs 1520944163955150848 1512309622000586752 1510159481370054656 1508003311372996608
pull-kubernetes-e2e-capz-azure-file 1500797647550681088
pull-kubernetes-e2e-capz-azure-file-windows 1500801509049241600 1500797647429046272