Update the way the Redis host(s) can be configured for the tests.

There is now a single property : redis-hosts.
This property must contain at least 2 host definitions of the form "host:port" (comma separated).
Sharding tests need 2 hosts ...

If this is not the case, the default value used is "localhost:6379,localhost:6380".
Tests that required one host are using the first definition.

src/test/java/redis/clients/jedis/tests/commands/TransactionCommandsTest.java

@@ -19,7 +19,7 @@ public class TransactionCommandsTest extends JedisCommandTestBase {
 	public void setUp() throws Exception {
 		super.setUp();
 
-		nj = new Jedis(host, port, 500);
+		nj = new Jedis(hnp.host, hnp.port, 500);
 		nj.connect();
 		nj.auth("foobared");
 		nj.flushAll();