[ofono] process modems asynchronously

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[ofono] process network props asynchronously

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[ofono] process operators asynchronously

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
set Sim presence earlier

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[ofono] interface is not used if interface pointer is reset

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[bluez] process d-bus replies asynchronously

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
Merge pull request #21 from nemomobile/async-network

Some dbus replies are processed asynchronously