Allow leader election controls for manager

[ukclivecox]

What this PR does / why we need it:

• Allows leadership election controls for manager. This will allow more control for devops in clusters that may have noisy/slow leadership election scenarios.

Which issue(s) this PR fixes:

Fixes #4147

Special notes for your reviewer:

[axsaucedo]

Looks good and basic tests locally seem to validate - running inteagrtion tests but we should be good to merge
/test integration

[seldondev]

@cliveseldon: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
integration	df11e69	link	/test integration

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[axsaucedo]

Only test fail is confirmed flaky - moving ahead with merge
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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