DAOS-18727 pool: Fix reconf error handling (#18442)

[liw]

When pool_svc_reconf_ult adds a PS replica, the replica creation request may encounter a network error such as -DER_GRPVER (e.g., if the destination rank has just started). This patch adds a retry loop for such errors, to avoid giving up the reconfiguration.

In addition, add flag CRT_RPC_FLAG_CO_FAILOUT to RSVC_START and RSVC_STOP CoRPCs, because by default a CoRPC executes the local handler even upon a group version mismatch, which seems unnecessary and has caused confusions during past debugging activities.

Steps for the author:

• Commit message follows the guidelines.
• Appropriate Features or Test-tag pragmas were used.
• Appropriate Functional Test Stages were run.
• At least two positive code reviews including at least one code owner from each category referenced in the PR.
• Testing is complete. If necessary, forced-landing label added and a reason added in a comment.

After all prior steps are complete:

• Gatekeeper requested (daos-gatekeeper added as a reviewer).

[github-actions]

Ticket title is './recovery/pool_list_consolidation.py:PoolListConsolidationTest.test_lost_majority_ps_replicas - rdb-pool are recovered, three out of four ranks should have rdb-pool'
Status is 'In Progress'
Labels: 'ci_master_daily,daily_test'
Job should run at elevated priority (1)
https://daosio.atlassian.net/browse/DAOS-18727

[daosbuild3]

Test stage Functional Hardware Large MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-18508/1/execution/node/1307/log

[daosbuild3]

Test stage Functional Hardware Medium MD on SSD completed with status UNSTABLE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net/job/daos-stack/job/daos//view/change-requests/job/PR-18508/1/testReport/