Updated minor servos (#871)

* Fix #865, fix #869, updated SRTMinorServo component

The component now handles correctly a SETUP command.
The component is also capable of commanding the gregorian air blade with the 'setGregorianAirBladeStatus' command.
A few bugs were fixed here and there.
This branch MUST be tested with the real hardware before merging it onto the centos_7_compatibility branch.

* Fixed small bug

* Various upgrades

* Updated _airBlade.py and _servoReset.py

* Updated _servoReset

* Updated telescopePark procedure commands order

With this order, the gregorian cover is started parking when the antenna is already at 89.8 degrees of elevation.
This will avoid getting an error on a gregorian cover axis pre limit.
Unfortunately, this will not fix a change in configuration from primary to gregorian or BWG and vice versa.
That will need to be addressed by opening a ticket.

* Upgraded _servoReset behahviour