Raise when the hardware connection fails instead of logging success

[mikelangmayr]

• the drivers report a failed connect by staying disconnected rather than raising, so _connect_hardware returned normally and on_start logged "Daemon started successfully and connected to hardware" on the line right after "Connection error: Connection timed out"
• the same pattern was in all five daemons that connect this way: inficon, adc, lakeshore, atccryo, srsthermal
• _connect_hardware now raises if the controller is not connected afterwards, so the existing except branch logs the failure and the "hardware is not available" warning, and initialize() is no longer called on a dead connection
• this also fixes writes to isconnected, which previously reported success when the hardware was unreachable; they now return the error
• verified with the hardware absent: lasterror reads "Failed to connect to hardware: no connection to :", a write to isconnected returns that error instead of ok, and with a connected controller initialize() still runs

[prkrtg]

Looks good, but it includes changes from #207?