Fix validation constraints for parameters in request body of form req… #79

Job	Run time
Build Java Client JDK8 (samples/client/echo_api/java/feign-gson)	58s
Build Java Client JDK8 (samples/client/echo_api/java/okhttp-gson)	1m 4s
Build Java Client JDK8 (samples/client/echo_api/java/apache-httpclient)	1m 19s
Build Java Client JDK8 (samples/client/echo_api/java/resttemplate)	1m 13s
Build Java Client JDK8 (samples/client/echo_api/java/resteasy)	57s
	5m 31s

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