Explicitly use HTTP2 transport in communication between

orchestrator and transcoder.
Mitigates issue in the golang's implementation of HTTP2
golang/go#32441

server/ot_rpc.go

@@ -23,6 +23,7 @@ import (
  "github.com/cenkalti/backoff"
  "github.com/golang/glog"
  "github.com/livepeer/lpms/ffmpeg"
+ "golang.org/x/net/http2"
  "google.golang.org/grpc"
  "google.golang.org/grpc/codes"
  "google.golang.org/grpc/credentials"
@@ -112,7 +113,7 @@ func runTranscoder(n *core.LivepeerNode, orchAddr string, capacity int) error {
  }
  }()
 
- httpc := &http.Client{Transport: &http.Transport{TLSClientConfig: &tls.Config{InsecureSkipVerify: true}}}
+ httpc := &http.Client{Transport: &http2.Transport{TLSClientConfig: &tls.Config{InsecureSkipVerify: true}}}
  var wg sync.WaitGroup
  for {
  notify, err := r.Recv()