Stop using legacy ptype "listener".

make: Only build "godeps" binary once.

Align 64-bit members that are accessed atomically.

Support limiting number of sessions per backend.

Make the response from the client auth backend OCS compliant

Update make targets to support parallel building.

For compliance with the OCS standard, the OCS response structure MUST
be {ocs: {meta:{...}, data: {...}}}. Until now the temporary auth
backend from the client only responded with the data and triggered an
'Incomplete OCS response' from the signaling server.

Adjust godeps for multiarch builds

Send ping to proxy regularly to detect broken connection.

Canonicalize all URLs before comparisons / lookups.

Otherwise urls like "https://server:443/foo/" will fail to find entries for
"https://server/foo/" and vice versa.

Add support for virtual sessions

README: Add missing information for creating group

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Fix proxy client cleanup

Add '--full-trickle' to janus command

The signaling server warns about the missing '--full-trickle' parameter, therefore adding this.

Otherwise it could happen that objects were kept in maps (e.g. on the
proxy server) if they reconnected to the WebRTC gateway during their
lifetime. This resulted in incorrect load calculations.

Send MCU messages through the session.

This helps with clients disconnecting / resuming while MCU responses
are being sent to them. With the change, the messages are stored in
the session and sent out when clients resume their session.

Minor reload improvements

In the past this disabled the MCU but now was triggering an error due to an
invalid (empty) URL. Keep old behaviour and disable MCU again.

- Add test that reloads without changes.
- Add test that removes backend from shared host.

Feature: Reload Backends on SIGHUP