PWX-33631: Hold round-robin lock only when needed/remove global lock #2342
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What this PR does / why we need it:
Cherry-pick pkg/loadbalancer from #2267
PWX-33631: Hold round-robin lock only when needed (#2335)
PWX-33631: Remove global lock on getRemoteConn (#2339)
Which issue(s) this PR fixes (optional)
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