HBASE-16638 Reduce the number of Connection's created in classes of hbase-spark module - addendum 2 (Weiqing Yang)

hbase-spark/src/test/scala/org/apache/hadoop/hbase/spark/HBaseConnectionCacheSuite.scala

@@ -78,6 +78,9 @@ class HBaseConnectionCacheSuite extends FunSuite with Logging {
 
   def testBasic() {
     HBaseConnectionCache.setTimeout(1 * 1000)
+    HBaseConnectionCache.connectionMap.synchronized {
+      HBaseConnectionCache.connectionMap.clear()
+    }
 
     val connKeyMocker1 = new HBaseConnectionKeyMocker(1)
     val connKeyMocker1a = new HBaseConnectionKeyMocker(1)