Disables contract-failed market test.

Author: benbierens

Tests/CodexReleaseTests/MarketTests/ContractFailedTest.cs

@@ -21,6 +21,7 @@ public class ContractFailedTest : MarketplaceAutoBootstrapDistTest
         private readonly TestToken pricePerSlotPerSecond = 10.TstWei();
 
         [Test]
+        [Ignore("Disabled for now: Test is unstable.")]
         public void ContractFailed()
         {
             var hosts = StartHosts();