.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/LibraryClassCheck/LibraryClassCheck.py

@@ -146,7 +146,7 @@ class LibraryClassCheck(ICiBuildPlugin):
 
 
         # If XML object exists, add result
-        if overall_status is not 0:
+        if overall_status != 0:
             tc.SetFailed("LibraryClassCheck {0} Failed.  Errors {1}".format(wsr_dec_path, overall_status), "CHECK_FAILED")
         else:
             tc.SetSuccess()