Use jdk 9 release binary

Author: steve-s

ci_common/common.hocon

@@ -2,7 +2,7 @@
 java7 : {name : oraclejdk, version : "7",    platformspecific: true}
 # java 8 must be a jvmci enabled variant
 java8 : {name : labsjdk, version : "8u171-jvmci-0.43", platformspecific: true}
-java9 : {name : labsjdk, version : "9-ea+168", platformspecific: true}
+java9 : {name : oraclejdk, version : "9.0.4+11", platformspecific: true}
 
 java8Downloads : {
   downloads : {