Allow user customize LeaderElectionID

[anggao]

What this PR does / why we need it:
Right now LeaderElectionID is hardcoded, this will cause issue if we run side-by-side seldon-core operator.

Which issue(s) this PR fixes:

Fixes #3576

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[seldondev]

Hi @anggao. Thanks for your PR.

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[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ukclivecox]

/test notebooks

[ukclivecox]

/test integration

[ukclivecox]

@anggao All looks good to me - lets just run the tests.