Fixed some unit tests that broke

Author: jstedfast

UnitTests/HeaderSetTests.cs

@@ -88,7 +88,7 @@ public void TestBasicFunctionality ()
 			Assert.That (headers, Has.Count.EqualTo (6), "Count #4");
 
 			Assert.That (headers.Contains (HeaderId.To), Is.True, "Contains #1");
-			Assert.That (headers, Does.Contain ("reply-to"), "Contains #2");
+			Assert.That (headers.Contains ("reply-to"), Is.True, "Contains #2");
 
 			var results = new string[headers.Count];
 			headers.CopyTo (results, 0);

UnitTests/Net/SocketUtilsTests.cs

@@ -47,7 +47,7 @@ public void TestConnectTimeout ()
 
 				var elapsed = stopwatch.Elapsed.TotalSeconds;
 
-				if (elapsed < 10 || elapsed > 12)
+				if (elapsed < 9.5 || elapsed > 12)
 					Assert.Fail ($"Expected timeout to be around 10 seconds, but was {elapsed} seconds.");
 				else
 					Assert.Pass ("Connect timed out as expected.");