MONDRIAN: [MONDRIAN-995] Fixes an issue with the MondrianOlap4jDriver…

… and the DriverManager from Java. Every java.sql.Driver implementation needs a public empty constructor so it can be instantiated correctly by JDBC. It is not explicitely specified by the JDBC specs, but Sun's JVM attempts to call that constructor none the less. We have also received some bug reports from the community about olap4j's driver implementation showing the same problems with WebSphere and some other JDBC pools. The same change will be made in XmlaOlap4jDriver.

[git-p4: depot-paths = "//open/mondrian/": change = 14636]

src/main/mondrian/olap4j/MondrianOlap4jDriver.java

@@ -74,7 +74,7 @@ public class MondrianOlap4jDriver implements Driver {
     /**
      * Creates a MondrianOlap4jDriver.
      */
-    MondrianOlap4jDriver() {
+    public MondrianOlap4jDriver() {
         this.factory = createFactory();
     }