remove mounting vsphere-config-secret in vsphere-csi-node daemonset

[divyenpatel]

What this PR does / why we need it:
This PR is removing mounting of vsphere-config-secret in vsphere-csi-node daemonset pods.

vsphere-config-secret is only required on node daemonset when topology feature is to be used.
This is required in the topology aware setup so that node can determine its topology by connecting to vCenter, to publish AccessibleTopology in the NodeGetInfoResponse.

Why we need this change now?
this change was already present in v1.0.2, but while merging development repository, this change was missed in this PR - #151

@RaunakShah added this fix in v1.0.2 - 136e3ec

Special notes for your reviewer:

Verified correctness in the yaml change with deploying driver using this updated yaml and latest image.

% kubectl create -f .
deployment.apps/vsphere-csi-controller created
csidriver.storage.k8s.io/csi.vsphere.vmware.com created
daemonset.apps/vsphere-csi-node created

Also verified basic provisioning workflow.

Release note:

removed mounting vsphere-config-secret requirement in vsphere-csi-node daemonset

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: divyenpatel, xing-yang

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