7.18.0 release (#22567) #1040

Job	Run time
Build Java Client JDK8 (samples/client/echo_api/java/feign-gson)	1m 28s
Build Java Client JDK8 (samples/client/echo_api/java/okhttp-gson)	1m 5s
Build Java Client JDK8 (samples/client/echo_api/java/apache-httpclient)	1m 21s
Build Java Client JDK8 (samples/client/echo_api/java/resttemplate)	1m 25s
Build Java Client JDK8 (samples/client/echo_api/java/resteasy)	1m 24s
	6m 43s

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