fix coordinator sync problem and update ready condition

[Congrool]

What type of PR is this?

/kind bug

What this PR does / why we need it:

1. make updating coordinator fields as atomic operation
2. add isPoolCacheSynced as one condition of pool-coordinator ready, fix what we didn't do in bufix: set isPoolCacheSynced as true if lease updated #1131

As discussed in #1126 (comment):

We should make the update of coordinator as an atomic operation to avoid undefined situation.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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In response to this:

What type of PR is this?

/kind bug

What this PR does / why we need it:

1. make updating coordinator fields as atomic operation
2. add isPoolCacheSynced as one condition of pool-coordinator ready, fix what we didn't do in bufix: set isPoolCacheSynced as true if lease updated #1131

As discussed in #1126 (comment):

We should make the update of coordinator as an atomic operation to avoid undefined situation.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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[codecov]

Codecov Report

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##             pool-coordinator-dev    #1142   +/-   ##
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  Hits                            ?     6552           
  Misses                          ?     6582           
  Partials                        ?      561           

Flag	Coverage Δ
unittests	47.84% <0.00%> (?)

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[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Congrool, rambohe-ch

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• OWNERS [rambohe-ch]

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