DAOS-12470 chk: misc fixes for chk related issues - I

[Nasf-Fan]

It contains the following fixes:

1. Protect pool service start/stop by cpr_mutex to handle concurrent access from check logic by race.

2. Typo for flag usage in chk_engine_start_prep() logic.

3. Do not skip IV message for the notification from check leader
   to the check engine that resides on the check leader rank.

4. Use CRT_IV_SYNC_NONE when IV update from check engine to the
   check leader to avoid broadcast IV message to all engines.

5. More log messages after check logic done (for pool start).

Signed-off-by: Fan Yong [email protected]

Before requesting gatekeeper:

• Two review approvals and any prior change requests have been resolved.
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[github-actions]

Bug-tracker data:
Ticket title is 'start_gc_ult() Assertion 'child->spc_gc_req == NULL' failed'
Status is 'In Progress'
https://daosio.atlassian.net/browse/DAOS-12470

[daosbuild1]

LGTM. No errors found by checkpatch.

[daosbuild1]

LGTM. No errors found by checkpatch.

[daosbuild1]

LGTM. No errors found by checkpatch.

[daosbuild1]

LGTM. No errors found by checkpatch.