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set fsGroup by securityContext.fsGroup in azure file
**What this PR does / why we need it**:
set fsGroup by securityContext.fsGroup in azure file
This PR respects `securityContext.fsGroup`, while if user both sets `gid=xxx` in mountOptions in azure storage class and `securityContext.fsGroup`, `gid=xxx` setting in mountOptions will win.
```
apiVersion: v1
kind: Pod
metadata:
name: security-context-demo
spec:
securityContext:
fsGroup: 2000
volumes:
- name: sec-ctx-vol
emptyDir: {}
containers:
- name: sec-ctx-demo
image: gcr.io/google-samples/node-hello:1.0
volumeMounts:
- name: sec-ctx-vol
mountPath: /data/demo
securityContext:
allowPrivilegeEscalation: false
```
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#44085
**Special notes for your reviewer**:
**Release note**:
```
set fsGroup by securityContext.fsGroup in azure file
```
/assign @karataliu
cc @rootfs @avaranovich
20f27a77ee