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/HostAndPortUtil.java

@@ -0,0 +1,58 @@
+package redis.clients.jedis.tests;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import redis.clients.jedis.Protocol;
+
+public class HostAndPortUtil {
+	private static List<HostAndPort> hostAndPortList = new ArrayList<HostAndPortUtil.HostAndPort>(2);
+	
+	static {
+		final HostAndPort defaulthnp1 = new HostAndPort();
+		defaulthnp1.host = "localhost";
+		defaulthnp1.port = Protocol.DEFAULT_PORT;
+		hostAndPortList.add(defaulthnp1);
+		
+		final HostAndPort defaulthnp2 = new HostAndPort();
+		defaulthnp2.host = "localhost";
+		defaulthnp2.port = Protocol.DEFAULT_PORT + 1;
+		hostAndPortList.add(defaulthnp2);
+
+		
+		final String envHosts = System.getProperty("redis-hosts");
+		if (null != envHosts && 0 < envHosts.length()) {
+			final String[] hostDefs = envHosts.split(",");
+			if (null != hostDefs && 2 <= hostDefs.length) {
+				hostAndPortList = new ArrayList<HostAndPortUtil.HostAndPort>(hostDefs.length);
+				for(String hostDef : hostDefs) {
+					final String[] hostAndPort = hostDef.split(":");
+					if (null != hostAndPort && 2 == hostAndPort.length) {
+						final HostAndPort hnp = new HostAndPort();
+						hnp.host = hostAndPort[0];
+						try {
+							hnp.port = Integer.parseInt(hostAndPort[1]);
+						} catch(final NumberFormatException nfe){
+							hnp.port  = Protocol.DEFAULT_PORT;
+						}
+						hostAndPortList.add(hnp);
+					}
+				}
+			}
+		}
+		final StringBuilder strb = new StringBuilder("Redis hosts to be used : ");
+		for(HostAndPort hnp : hostAndPortList){
+			strb.append('[').append(hnp.host).append(':').append(hnp.port).append(']').append(' ');
+		}
+		System.out.println(strb);
+	}
+
+	public static List<HostAndPort> getRedisServers() {
+		return hostAndPortList;
+	}
+	
+	public static class HostAndPort {
+		public String host;
+		public int port;
+	}
+}