fix sc across cluster can point to the same instance pool

[leiyiz]

trafficstars

What type of PR is this? /kind bug

What this PR does / why we need it: before this fix multiple clusters can have the same sc, which would point to the same storage pool and cause race conditions. We add 2 more tags to uniquely identify which cluster each instance was managed by. The reason we added 2 tags are because cluster names are unique per location and zone name + cluster name might exceed 63 char.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

if multishare is enabled, the container now requires "--gke-cluster-name" flag to be set

[saikat-royc]

Before submitting this PR we should also verify GKE can actually plumb the cluster name and location to the yamls

[saikat-royc]

Please update the description of the PR to provide a background context why these extra tags are needed (also why two separate tags needed)

[saikat-royc]

/lgtm /approve

[k8s-ci-robot]

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