Anton Kaliaev eb5cf0f0dd ignore existing peers in DialPeersAsync (#2327)
* ignore existing peers in DialPeersAsync

Fixes #2253

* rename HasPeerWithAddress to IsDialingOrExistingAddress

[breaking] remove Switch#IsDialing

* check if addrBook is nil

to be consistent with other usages of addrBook across Switch

* different log messages for 2 use-cases
2018-09-05 11:52:22 -04:00
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