NXP-14357: Reorganize pdate constant imports
NXP-14357: Stop sync thread if update required + don't start it if update required or no server bindings
NXP-14357: Improve inline comments
NXP-14357: Make update prompt dialog generic to also handle required upgrade / downgrade
NXP-14357: Fix required upgrade / downgrade systray label
NXP-11588: Add utility scripts to test application update
NXP-13817: Fix duplicate logs introduced in test_updater.py