[TEST] Ignore bogus system properties.

LuceneTestCase might reset some solr properties that cause
our tests to fail if the run before in the same JVM We just ignore
solr properties.

src/test/java/org/apache/lucene/util/AbstractRandomizedTest.java

@@ -144,7 +144,8 @@ public abstract class AbstractRandomizedTest extends RandomizedTest {
      * @see #classRules
      */
     private static final String[] IGNORED_INVARIANT_PROPERTIES = {
-            "user.timezone", "java.rmi.server.randomIDs", "sun.nio.ch.bugLevel"
+            "user.timezone", "java.rmi.server.randomIDs", "sun.nio.ch.bugLevel",
+            "solr.directoryFactory", "solr.solr.home", "solr.data.dir" // these might be set by the LuceneTestCase -- ignore
     };
 
     // -----------------------------------------------------------------