This makes package updates more robust, avoiding in-place replaces of
the plugins.
Previously, if an upgrade transaction was terminated, NetworkManager
library could end up being of a different version than the plugins.
If the user was unfortunate enough to connect using a connection that
required a plugin (say, Wi-Fi), he would be left without a network
connection making it somewhat inconvenient to recover from the botched
upgrade.
This makes the whole situation a little bit less sad.
The VPN plugins are kept where they always have been -- the path is not
qualified with a version number.
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