MockClient Async Capabilities

[mikhailkolesnik]

More often than not we would like to do
go client.Put(...)
in our code.
But this creates issues with testing such code. Namely there is a problem with syncing on the logging code so that test can reliably check of a certain message has been Put.
I've introduced this PR to enable the general possibility of such a test. But test code that tests for the fact that 2 messages have been pushed now looks like this:

	timeout := make(chan bool, 1)
	go func() {
		time.Sleep(1 * time.Second)
		timeout <- true
	}()
	select {
	case <-gTritonLogger.Channel:
		go func() {
			time.Sleep(1 * time.Second)
			timeout <- true
		}()
		select {
		case <-gTritonLogger.Channel:
		case <-timeout:
			assert.Fail(t,"GetQuotes has not been logged to tritonD")
		}
	case <-timeout:
		assert.Fail(t,"Place Quote has not been logged to tritonD")
	}

	tData := gTritonLogger.StreamData
	assert.Equal(t, 2, len(tData))
	singlPQLogEntry, ok := tData[GetQuotesSinglePlaceEventName]
	assert.True(t, ok)
	assert.EqualValues(t, pq.QuoteUUID, singlPQLogEntry[0]["request_uuid"])
	getQuotesLogEntry, ok := tData[GetQuotesEventName]
	assert.True(t, ok)
	assert.EqualValues(t, pq.RequestUUID, getQuotesLogEntry[0]["request_uuid"])

Something need to be done about MockClient so it is easier to test async usages of TritonD Client.