ApkWorkload: only uninstall if package is already installed
ApkWorkload: only uninstall if package is already installed

Attempting to uninstall an non-existing package will result in an error.
So, when replace=True for install_apk(), only attempt to uninstall if
the package is already present on the target.

jimboatarm/workload-automation,bjackman/workload-automation,bjackman/workload-automation,bjackman/workload-automation,bjackman/workload-automation,jimboatarm/workload-automation,jimboatarm/workload-automation,jimboatarm/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation