testHotspot suffered from improper cleanup and if a single test failed
all subsequent tests would fail due to IWD still running since IWD()
was never cleaned up.
In addition the PSK agent and hwsim rules are now set onto the cls
object and removed in tearDownClass()
This (hopefully) will make this test pass better on slower machines.
In addition the mechanism of copying over separate main.conf files
was changed (rather than echo'ing the option into /tmp/main.conf)
'Connected' property of the network object is set before the connection
attempt is made and does not indicate a connection success. Therefore,
use device status property to identify the connection status of the device.
