use callbacks for signaling the session status

Instead of exposing a session.handshakeStatus() <-chan error, it's
easier to pass a callback to the session which is called when the
handshake is done.
The removeConnectionID callback is in preparation for IETF QUIC, where a
connection can have multiple connection IDs over its lifetime.

mock_session_runner_test.go

@@ -0,0 +1,55 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/lucas-clemente/quic-go (interfaces: SessionRunner)
+
+// Package quic is a generated GoMock package.
+package quic
+
+import (
+	reflect "reflect"
+
+	gomock "github.com/golang/mock/gomock"
+	protocol "github.com/lucas-clemente/quic-go/internal/protocol"
+)
+
+// MockSessionRunner is a mock of SessionRunner interface
+type MockSessionRunner struct {
+	ctrl     *gomock.Controller
+	recorder *MockSessionRunnerMockRecorder
+}
+
+// MockSessionRunnerMockRecorder is the mock recorder for MockSessionRunner
+type MockSessionRunnerMockRecorder struct {
+	mock *MockSessionRunner
+}
+
+// NewMockSessionRunner creates a new mock instance
+func NewMockSessionRunner(ctrl *gomock.Controller) *MockSessionRunner {
+	mock := &MockSessionRunner{ctrl: ctrl}
+	mock.recorder = &MockSessionRunnerMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockSessionRunner) EXPECT() *MockSessionRunnerMockRecorder {
+	return m.recorder
+}
+
+// onHandshakeComplete mocks base method
+func (m *MockSessionRunner) onHandshakeComplete(arg0 packetHandler) {
+	m.ctrl.Call(m, "onHandshakeComplete", arg0)
+}
+
+// onHandshakeComplete indicates an expected call of onHandshakeComplete
+func (mr *MockSessionRunnerMockRecorder) onHandshakeComplete(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "onHandshakeComplete", reflect.TypeOf((*MockSessionRunner)(nil).onHandshakeComplete), arg0)
+}
+
+// removeConnectionID mocks base method
+func (m *MockSessionRunner) removeConnectionID(arg0 protocol.ConnectionID) {
+	m.ctrl.Call(m, "removeConnectionID", arg0)
+}
+
+// removeConnectionID indicates an expected call of removeConnectionID
+func (mr *MockSessionRunnerMockRecorder) removeConnectionID(arg0 interface{}) *gomock.Call {
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "removeConnectionID", reflect.TypeOf((*MockSessionRunner)(nil).removeConnectionID), arg0)
+}