Vagrant: make Android dev box script more robust

When the oor-dev-android box is shut down and then started up again,
running the SDK install script again fails at the creation of the AVD.
Force recreating it if the script is run, so that the script doesn't
fail and we get a clean environment.

Signed-off-by: Lorand Jakab <lojakab@cisco.com>

vagrant/install-android-sdk.sh

@@ -56,7 +56,7 @@ $ANDROID_SDK_ROOT/tools/bin/sdkmanager "build-tools;${BUILD_TOOLS_VERSION}"
 echo "Downloading and installing Google APIs System Image for ${EMU_ABI} ABI"
 $ANDROID_SDK_ROOT/tools/bin/sdkmanager "${ANDROID_SYSTEM_IMAGE}"
 echo "Creating Nexus 5X API ${EMU_API} ${EMU_ABI} Android Virtual Device (AVD)"
-$ANDROID_SDK_ROOT/tools/bin/avdmanager create avd --tag "${EMU_TAG}" --package "${ANDROID_SYSTEM_IMAGE}" --name "Nexus_5X_API_${EMU_API}_${EMU_ABI}" --abi $EMU_ABI --device "Nexus 5X"
+$ANDROID_SDK_ROOT/tools/bin/avdmanager create avd --force --tag "${EMU_TAG}" --package "${ANDROID_SYSTEM_IMAGE}" --name "Nexus_5X_API_${EMU_API}_${EMU_ABI}" --abi $EMU_ABI --device "Nexus 5X"
 
 # Install Android Emulator dependencies
 sudo apt-get -y -q install libpulse0 libglu1-mesa