Do not escape <> characters

- sed on Mac ignored unnecessary escape and treated \< to match <
  but GNU sed seem to treat \< in a way it will not match <

Change-Id: I8be9f22d632c3c7a9f007b36d18716cefdd9286e
diff --git a/tools/build/onos-change-version b/tools/build/onos-change-version
index 3ce5557..fa9a2ad 100755
--- a/tools/build/onos-change-version
+++ b/tools/build/onos-change-version
@@ -46,7 +46,7 @@
 sed -i".VERBACK" -E "s/-DarchetypeVersion=[^\"]*/-DarchetypeVersion=$NEW_VERSION/g" $ONOS_ROOT/tools/test/bin/onos-archetypes-test
 
 # Fix the onos-build-conf version
-sed -i".VERBACK" -E "s/\<onos-build-conf.version\>.*\<.onos-build-conf.version\>/\<onos-build-conf.version\>$NEW_VERSION\<\/onos-build-conf.version\>/g" $ONOS_ROOT/lib/pom.xml
+sed -i".VERBACK" -E "s/<onos-build-conf.version>.*<\/onos-build-conf.version>/<onos-build-conf.version>$NEW_VERSION<\/onos-build-conf.version>/g" $ONOS_ROOT/lib/pom.xml
 mvn -f tools/build/conf/pom.xml versions:set -DnewVersion=$NEW_VERSION versions:commit
 
 # Version the BUCK artifacts