It's a part of bigger and unfinished tcp-transport PR.

Here:
- Fix of tcp-transport itself - it did not send laddr during Dial so
on Accept on another edge was broken
- Fix of memoryPubKeyTable: reverse search of pk was broken
- FilePubKeyTable - simplified, now composed from memoryPubKeyTable
- tests of tcp-transport - under no_ci tags because they need prepared IP addresses
- .travis-ci now prepares IP aliases for tests

Excluding the last task defined  in skycoin/skywire#501 - everything is completed.

It was already done by most part a long time before.

The most hard part is in the last task.