swarm / rcmgr: synchronize the concurrent outbound dials with limits #1898
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We see flakiness in CI because a client will dial with concurrency 8 but the limit on the server is 4 so we get rcmgr failures. We notice this when we have a lot of addrs to dial.
Fixes #1816
Fixes #1765
Fixes #1730
Fixes #1668
(will rebase to master after #1881 is merged)