Some improvements to release tools

Change-Id: I651866d746a1e661fcefe0b28ef1e8e57cd502e9
diff --git a/tools/build/onos-release-prerequisites b/tools/build/onos-release-prerequisites
index dc7f098..38e69e8 100755
--- a/tools/build/onos-release-prerequisites
+++ b/tools/build/onos-release-prerequisites
@@ -39,7 +39,7 @@
     trap "echo 'FAILED'" ERR
     printf "Checking Java version... "
     v=$(javac -version 2>&1 | grep 1.8.0_ | sed -e 's/.*1.8.0_\([0-9]*\).*/\1/g')
-    test "$v" -ge 74
+    test "$v" -ge 73
     echo "OK"
 }