.pytool: Add CI support for host based unit tests with results

https://bugzilla.tianocore.org/show_bug.cgi?id=2505

* Add plugin to build and run host based unit tests
* Add plugin that performs a DSC complete check DSC files
  used to build host based tests
* Update DscCompleteCheck plugin to ignore module INFs with
  a MODULE_TYPE of HOST_APPLICATION and library INFs that
  only support a module type of HOST_APPLICATION.
* Fix issues in XML reports from checkers.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Bret Barkelew <Bret.Barkelew@microsoft.com>

.pytool/Plugin/HostUnitTestCompilerPlugin/Readme.md

@@ -0,0 +1,24 @@
+# Host UnitTest Compiler Plugin
+
+A CiBuildPlugin that compiles the dsc for host based unit test apps.
+An IUefiBuildPlugin may be attached to this plugin that will run the unit tests and collect the results after successful compilation.
+
+## Configuration
+
+The package relative path of the DSC file to build.
+
+``` yaml
+"HostUnitTestCompilerPlugin": {
+    "DscPath": "<path to dsc from root of pkg>"
+}
+```
+
+### DscPath
+
+Package relative path to the DSC file to build.
+
+## Copyright
+
+Copyright (c) Microsoft Corporation.
+SPDX-License-Identifier: BSD-2-Clause-Patent
+