remove installation of maven, now included in the base Ubuntu image

Change-Id: I41c35e8351787ebc259154153bdc4fcdc2318b94
diff --git a/jjb/onos/onos-yang-tools-verify.sh b/jjb/onos/onos-yang-tools-verify.sh
index d76316d..c81596c 100755
--- a/jjb/onos/onos-yang-tools-verify.sh
+++ b/jjb/onos/onos-yang-tools-verify.sh
@@ -1,8 +1,3 @@
 #!/bin/bash -ex
 
-# FIXME include in base image?
-curl -o apache-maven-3.5.2-bin.tar.gz -L 'http://www.apache.org/dyn/closer.cgi?filename=maven/maven-3/3.5.2/binaries/apache-maven-3.5.2-bin.tar.gz&action=download'
-tar xf apache-maven-3.5.2-bin.tar.gz
-PATH=`pwd`/apache-maven-3.5.2/bin:$PATH
-echo $PATH
 mvn clean install