Port HTTPlease.Testability.Xunit and fix remaining compile errors

#166

Author: tintoy

samples/ConfigFromConfigMap/ConfigFromConfigMap.csproj

@@ -8,9 +8,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\..\src\KubeClient\KubeClient.csproj" />
-    <ProjectReference Include="..\..\src\KubeClient.Extensions.Configuration\KubeClient.Extensions.Configuration.csproj" />
-    <ProjectReference Include="..\..\src\KubeClient.Extensions.KubeConfig\KubeClient.Extensions.KubeConfig.csproj" />
+    <ProjectReference Include="../../src/KubeClient/KubeClient.csproj" />
+    <ProjectReference Include="../../src/KubeClient.Extensions.Configuration/KubeClient.Extensions.Configuration.csproj" />
+    <ProjectReference Include="../../src/KubeClient.Extensions.KubeConfig/KubeClient.Extensions.KubeConfig.csproj" />
   </ItemGroup>
 
   <ItemGroup>

samples/ConfigFromConfigMap/Program.cs

@@ -1,5 +1,4 @@
-using HTTPlease;
-using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Primitives;
@@ -11,6 +10,7 @@
 namespace KubeClient.Samples.ConfigFromConfigMap
 {
     using Extensions.Configuration;
+    using Http;
     using Models;
 
     /// <summary>