Move maven script to jcefmaven repo

maven_gen/.gitignore

@@ -1,2 +0,0 @@
-build
-out

maven_gen/generate_maven_builds.sh

@@ -1,14 +0,0 @@
-#!/bin/bash
-
-if [ ! $# -eq 1 ]
-  then
-    echo "Usage: ./generate_maven_builds.sh <build_meta_url>"
-    echo ""
-    echo "build_meta_url: The url to download build_meta.json from"
-    exit 1
-fi
-
-#Download build_meta.json and import to local environment
-export $(curl -s -L $1 | jq -r "to_entries|map(\"\(.key)=\(.value|tostring)\")|.[]")
-
-echo "Creating maven artifacts for $release_tag..."