[connman-qt] Set idle state for saved networks when they are no longer available.

When going out of range or when powering off WLAN the network service
maybe left with the State property set to connecting, etc. Always set
it to idle when the network service is being reused because it is a
saved network.
Merge pull request #78 from amccarthy/idle-saved-networks

[connman-qt] Set idle state for saved networks when they are no longer a...