refactor: Improve handshake resiliency of peer (#95)

* fix: Synchronize peer logging with a channel

We were depending on the close mutex to properly
report connection state. This ensures the RTC
connection is properly closed before returning.

* Disable pion logging

* Remove buffer

* Try ICE servers

* Remove flushed

* Add diagram explaining handshake

* Fix candidate accept ordering

* Add debug logging to peerbroker

* Fix send ordering

* Lock adding ICE candidate

* Add test for negotiating out of order

* Reduce connection to a single negotiation channel

* Improve test times by pre-installing Terraform

* Lock remote session description being applied

* Organize conn

* Revert to multi-channel setup

* Properly close ICE gatherer

* Improve comments

* Try removing buffered candidates

* Buffer local and remote messages

* Log dTLS transport state

* Add pion logging

go.mod

@@ -13,7 +13,6 @@ require (
 	github.com/golang-migrate/migrate/v4 v4.15.1
 	github.com/google/uuid v1.3.0
 	github.com/hashicorp/go-version v1.4.0
-	github.com/hashicorp/hc-install v0.3.1
 	github.com/hashicorp/terraform-config-inspect v0.0.0-20211115214459-90acf1ca460f
 	github.com/hashicorp/terraform-exec v0.15.0
 	github.com/justinas/nosurf v1.1.1
@@ -64,7 +63,6 @@ require (
 	github.com/google/go-cmp v0.5.7 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
-	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/hashicorp/hcl/v2 v2.11.1 // indirect