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connpool: speed up `call()` when non-prioritized

The connection pool `call()` function used to connect to all of the
instances matching some specified static requirements and synchronously
select one of the active. It was slower a lot times slower than its
possible because the connpool only actually needs one active connection
to perform the call.

This patch makes the connection pool `call()` function work a bit
smarter. Now if the priorities (`prefer_ro`/`prefer_rw` call modes)
aren't used within the `connpool.call()` the pool will wait for any
connection matching the requirements as a candidate to perform the call.

Closes #10598

NO_DOC=no visible api changes

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