ONLINE and LOGIN are also "connected" states.

ONLINE and LOGIN are also "connected" states.

Code was initially done with CONNMAN_SERVICE_STATE_READY being the
only valid connected state, but later on CONNMAN_SERVICE_STATE_LOGIN
and CONNMAN_SERVICE_STATE_ONLINE were introduced, breaking couple of
functions that assumed the old behavior.

This patch creates the is_connected() function, similar to
is_connecting() and uses it instead.

__connman_service_indicate_state() checks just for ONLINE, as
requested by Marcel.