IsLikelyNotMountPoint issue when upgrade k8s.io/mount-utils from v0.29.4 to v0.30.2

[andyzhangx]

What happened:
need to find out whether it's ok to upgrade to k8s.io/mount-utils, what's the change and impact in vendor/k8s.io/mount-utils/mount_linux.go

I0712 03:39:30.760769   14023 driver.go:93] Enabling controller service capability: EXPAND_VOLUME
    nodeserver_test.go:1040: 
        	Error Trace:	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/azurefile/nodeserver_test.go:1040
        	Error:      	Received unexpected error:
        	            	rpc error: code = Internal desc = Could not mount target ./target_test: not a directory
        	Test:       	TestNodePublishVolumeIdempotentMount
    nodeserver_test.go:1042: 
        	Error Trace:	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/azurefile/nodeserver_test.go:1042
        	Error:      	Received unexpected error:
        	            	rpc error: code = Internal desc = Could not mount target ./target_test: not a directory
        	Test:       	TestNodePublishVolumeIdempotentMount
    nodeserver_test.go:1056: 
        	Error Trace:	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/azurefile/nodeserver_test.go:1056
        	Error:      	Not equal: 
        	            	expected: 1
        	            	actual  : 0
        	Test:       	TestNodePublishVolumeIdempotentMount
--- FAIL: TestNodePublishVolumeIdempotentMount (0.01s)

986ddc9#diff-9d276589000ecf169e4bb915a05a8c339bcb5e6c09c3d7734f915eedc246a404

What you expected to happen:

How to reproduce it:

Anything else we need to know?:

Environment:

• CSI Driver version:
• Kubernetes version (use kubectl version):
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others:

[andyzhangx]

/assign @cvvz

[andyzhangx]

duplicated to issue mentioned here: #2055 (comment):

the reimplemented IsLikelyNotMountPoint func in mount-utils would make one unit test fail, current IsLikelyNotMountPoint would return error on an empty dir with not a directory, I think that's a bug, we need to fix it in upstream k8s main repo.

=== RUN   TestNodePublishVolumeIdempotentMount
I0817 02:55:14.201401   14208 driver.go:93] Enabling controller service capability: CREATE_DELETE_VOLUME
I0817 02:55:14.201441   14208 driver.go:93] Enabling controller service capability: EXPAND_VOLUME
    nodeserver_test.go:1040: 
        	Error Trace:	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/azurefile/nodeserver_test.go:1040
        	Error:      	Received unexpected error:
        	            	rpc error: code = Internal desc = Could not mount target ./target_test: not a directory
        	Test:       	TestNodePublishVolumeIdempotentMount
    nodeserver_test.go:1042: 
        	Error Trace:	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/azurefile/nodeserver_test.go:1042
        	Error:      	Received unexpected error:
        	            	rpc error: code = Internal desc = Could not mount target ./target_test: not a directory
        	Test:       	TestNodePublishVolumeIdempotentMount
    nodeserver_test.go:1056: 
        	Error Trace:	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/azurefile/nodeserver_test.go:1056
        	Error:      	Not equal: 
        	            	expected: 1
        	            	actual  : 0
        	Test:       	TestNodePublishVolumeIdempotentMount