pions / webrtc / 744

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travis-ci

Fix portsManager/IceAgent deadlock

PortsManager + IceAgent are both protected by a mutex, and they both
have the ability to call and lock on other.

In a reproducible deadlock the IceAgent would send a message via the
ports manager, and at the same time the portsManager was attempting to
query the IceAgent for valid candidates.

This is fixed by moving the portsManager to a ReadLock. The places where
we lock don't have this interaction

Resolves #78, Resolves #108

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