Uninstall the test app in shutdown

After MicrodroidHostTestCases, MicrodroidTestApp.apk isn't uninstalled
and leaves some files under its data directory. It makes subsequent
MicrodroidTests flaky.

Bug: 224747083
Test: atest MicrodroidHostTestCases MicrodroidTests
Change-Id: Ie8f3a22c0986c9bbffdc743def5e592850e3ec8e
diff --git a/tests/hostside/java/android/virt/test/MicrodroidTestCase.java b/tests/hostside/java/android/virt/test/MicrodroidTestCase.java
index f305372..5b71eba 100644
--- a/tests/hostside/java/android/virt/test/MicrodroidTestCase.java
+++ b/tests/hostside/java/android/virt/test/MicrodroidTestCase.java
@@ -445,5 +445,7 @@
 
         archiveLogThenDelete(mTestLogs, getDevice(), LOG_PATH,
                 "vm.log-" + mTestName.getMethodName());
+
+        getDevice().uninstallPackage(PACKAGE_NAME);
     }
 }