BaseTools/HostBasedUnitTestRunner: Promote Unittest error to CI fail.

Some unit tests would fail to execute or execute and not produce any output
logs. In these cases, the only output would be in the CI Log as
`UnitTest Execution Error`.

A UnitTest Execution Error should be considered the same as a unit tests
test failing.

Signed-off-by: Aaron Pop <aaronpop@microsoft.com>

BaseTools/Plugin/HostBasedUnitTestRunner/HostBasedUnitTestRunner.py

@@ -113,6 +113,7 @@ def do_post_build(self, thebuilder):
                 if ret != 0:
                     logging.error("UnitTest Execution Error: " +
                                   os.path.basename(test))
+                    failure_count += 1
                 else:
                     logging.info("UnitTest Completed: " +
                                  os.path.basename(test))