Fixes 2 issues:

1. In the State change test, 123->0 will hit a c-core GPR_ASSERT if
debugging is enabled because 123 doesn't map to a state that can
be printed.
2. In the Server test, 8888 is sometimes unavailable, so we just use
a wildcard port.

src/php/tests/unit_tests/ChannelTest.php

@@ -99,7 +99,7 @@ class ChannelTest extends PHPUnit_Framework_TestCase
         $this->channel = new Grpc\Channel('localhost:0',
              ['credentials' => Grpc\ChannelCredentials::createInsecure()]);
         $time = new Grpc\Timeval(1000);
-        $state = $this->channel->watchConnectivityState(123, $time);
+        $state = $this->channel->watchConnectivityState(1, $time);
         $this->assertTrue($state);
         unset($time);
     }

src/php/tests/unit_tests/ServerTest.php

@@ -67,9 +67,9 @@ class ServerTest extends PHPUnit_Framework_TestCase
     public function testRequestCall()
     {
         $this->server = new Grpc\Server();
-        $port = $this->server->addHttp2Port('0.0.0.0:8888');
+        $port = $this->server->addHttp2Port('0.0.0.0:0');
         $this->server->start();
-        $channel = new Grpc\Channel('localhost:8888',
+        $channel = new Grpc\Channel('localhost:' . $port,
              ['credentials' => Grpc\ChannelCredentials::createInsecure()]);
 
         $deadline = Grpc\Timeval::infFuture();