Fix APN settings reset on a couple of fronts
- Make sure disabling and enabling data connection goes through lomiri-indicator-network, as otherwise it'll just override us.
- Handle the fact that upstream version of libqofono's resetContexts() [1] is asynchronous, as opposed to Canonical's patch [2].
[1] https://github.com/sailfishos/libqofono/blob/5c3c7c46f39bd165e2cbaf1e2a2dd406d4201f4f/src/qofonoconnectionmanager.cpp#L147
[2] https://bazaar.launchpad.net/~phablet-team/libqofono/ubuntu/view/head:/debian/patches/connman-resetcontexts.patch
Edited by Ratchanan Srirattanamet