Fix slow connect crashing the connection pool - #928
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Convert a connection call timeout into a checkout error. The pool must not terminate just because a DNS/TCP/TLS attempt outlives its timeout. Fixes: benoitc#927
Only exit:{timeout, _} was caught, so a transport raising or the conn
being killed while dialing still took the pool down. Catch any exit from
the connect call and return it as a checkout error. The caller already
stops the conn on every error return.
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Convert a connection call timeout into a checkout error. The pool must not terminate just because a DNS/TCP/TLS attempt outlives its timeout.
Fixes: #927