[connman-qt] emit propertyChanged and propertiesReady signal even if properties are passed
in c'tor.
[connman-qt] Just go ahead and emit servicesChanged when NetworkService
is created with properties, since we know the properties are good.

partially revert previous change and only emit properties when they
actually change.
[connman-qt] remove available guard when tech or services enabled.
It doesn't ceash here when connman goes away, which is the original
reason they were added.
[connman-qt] send 'Already connected' error if already connected
when trying a requestConnect
Merge pull request #116 from lpotter/master

[connman-qt] emit propertyChanged and propertiesReady signal even if pro...