Multiple fixes for GRPC and de-awsify

[denysvitali]

This (draft) PR adds the following improvements:

• Improve GRPC to use proto3
• Add reflection possibility for GRPC (env:"CONTROL_GRPC_REFLECTION_API")

$ grpcurl -plaintext 127.0.0.1:24030 describe hashicorp.waypoint_hzn.WaypointHzn
hashicorp.waypoint_hzn.WaypointHzn is a service:
service WaypointHzn {
  rpc DeleteHostname ( .hashicorp.waypoint_hzn.DeleteHostnameRequest ) returns ( .google.protobuf.Empty );
  rpc ListHostnames ( .hashicorp.waypoint_hzn.ListHostnamesRequest ) returns ( .hashicorp.waypoint_hzn.ListHostnamesResponse );
  rpc RegisterGuestAccount ( .hashicorp.waypoint_hzn.RegisterGuestAccountRequest ) returns ( .hashicorp.waypoint_hzn.RegisterGuestAccountResponse );
  rpc RegisterHostname ( .hashicorp.waypoint_hzn.RegisterHostnameRequest ) returns ( .hashicorp.waypoint_hzn.RegisterHostnameResponse );
}

• Add InsecureSkipVerify to connect to self-signed Control backends (env:"CONTROL_INSECURE_SKIP_VERIFY")
• Change ports in docker-compose* to be able to run waypoint-hzn together with horizon
• First steps towards de-awszification (making Horizon and waypoint-hzn run outside of AWS)

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