refactor to initialize shared informer only once

[andrewsykim]

Signed-off-by: Andrew Sy Kim kiman@vmware.com

What this PR does / why we need it:
Follow-up PR to #244 - which also ensures the single shared informer is initialized only once and removes the need for the InformerManager type.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

NONE

/assign @dvonthenen

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[andrewsykim]

/close

Other vSphere components (like CSI) use what's in pkg/common, so going to close this for now so we keep those libraries consistent.

[k8s-ci-robot]

@andrewsykim: Closed this PR.

In response to this:

/close

Other vSphere components (like CSI) use what's in pkg/common, so going to close this for now so we keep those libraries consistent.

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