Change libevent
event loop to wait forever when blocking
#15243
Merged
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Same as #14949 but with a twist:the libevent evloop no longer returns when it's empty (no queued events), so the behavior doesn't rely on the existence of the stack-pool-collector fiber repeatedly sleeping.The Polling evloop already waits forever (when blocking) and IOCP will also with #15238.
edit: extracted drop fiber channel commit.