Removed unnecessary cast to HttpClientErrorException as both classes … #1367

Job	Run time
Build Java Client JDK11 (samples/client/echo_api/java/resttemplate)	1m 27s
Build Java Client JDK11 (samples/client/echo_api/java/feign-gson)	1m 18s
Build Java Client JDK11 (samples/client/echo_api/java/apache-httpclient)	1m 23s
Build Java Client JDK11 (samples/client/echo_api/java/resteasy)	54s
Build Java Client JDK11 (samples/client/echo_api/java/native)	1m 22s
	6m 24s

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