Uninstall verification fails due to msiexec exiting before app is uninstall

 msiexec will exit almost immediately after install or uninstall command is executed. This is limitation of msiexec. We need to find out how we can wait when install/uninstall actually completed.
This issue is reproducible intermittently.

For example following command will fail:
bash test_jpackage.sh -t JDK_TO_TEST -v -- -Djpackage.test.disabledPackagers=exe -Djpackage.test.keep-work-dir=p,f test/jdk/tools/jpackage/share/EmptyFolderPackageTest.java