Add support for custom tls server names. #1030

Job	Run time
Build Java Client JDK8 (samples/client/echo_api/java/apache-httpclient)	1m 23s
Build Java Client JDK8 (samples/client/echo_api/java/resteasy)	1m 17s
Build Java Client JDK8 (samples/client/echo_api/java/feign-gson)	1m 10s
Build Java Client JDK8 (samples/client/echo_api/java/okhttp-gson)	1m 11s
Build Java Client JDK8 (samples/client/echo_api/java/resttemplate)	1m 7s
	6m 8s

Provide feedback