Add back the option of allowing user to specify neo4j downaload link

Author: zhenlineo

driver/src/test/java/org/neo4j/driver/util/Neo4jInstaller.java

@@ -44,7 +44,7 @@ public static boolean isWindows()
         }
     }
 
-    static final String version = "3.0.0-M01-NIGHTLY";
+    static final String version = System.getProperty( "version", "3.0.0-M01-NIGHTLY" );
 
     private static final File neo4jDir = new File( "./target/neo4j" );
 

driver/src/test/java/org/neo4j/driver/util/Neo4jWindowsInstaller.java

@@ -23,6 +23,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.net.URI;
 
 import static java.lang.String.format;
 
@@ -65,7 +66,8 @@ public int stopNeo4j() throws IOException
     @Override
     String neo4jPackageUrl()
     {
-        return winPackageUrl;
+        String url = System.getProperty( "packageUri", winPackageUrl );
+        return URI.create( url ).toString();
     }
 
     @Override