Build pipeline updates (#191)

* Use 'clear' to prevent nuget multi-feed problems.

* Disable Azure tests

Author: StephenMolloy

.nuget/NuGet.Config

@@ -4,6 +4,7 @@
     <add key="disableSourceControlIntegration" value="true" />
   </solution>
   <packageSources>
+    <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
   </packageSources>
 </configuration>

test/Microsoft.Configuration.ConfigurationBuilders.Test/AzureAppConfigTests.cs

@@ -45,7 +45,7 @@ public class AzureAppConfigTests
         private readonly string kvUriRegex = "{\"uri\":\".+\"}";
 
 
-        public static bool AppConfigTestsEnabled => true;
+        public static bool AppConfigTestsEnabled => false;
 
         static AzureAppConfigTests()
         {

test/Microsoft.Configuration.ConfigurationBuilders.Test/AzureTests.cs

@@ -38,7 +38,7 @@ public class AzureTests
         private readonly string customVersionOld;
         private readonly string customVersionNotExist = "abcVersionDoesNotExistXyz";
 
-        public static bool AzureTestsEnabled => true;
+        public static bool AzureTestsEnabled => false;
 
         public AzureTests()
         {