[thermalctld] [psud] [chassisd] Fix crash with undefined environment variable

[bratashX]

When PSUD_UNIT_TESTING and THERMALCTLD_UNIT_TESTING variables don`t set we have the next problems:

 psud Traceback (most recent call last):
 psud File "/usr/local/bin/psud", line 21, in <module>
 psud if os.environ["PSUD_UNIT_TESTING"] == "1":
 psud File "/usr/lib/python2.7/UserDict.py", line 40, in __getitem__
 psud raise KeyError(key)
 psud KeyError: 'PSUD_UNIT_TESTING'

 thermalctld Traceback (most recent call last):
 thermalctld File "/usr/local/bin/thermalctld", line 19, in <module>
 thermalctld if os.environ["THERMALCTLD_UNIT_TESTING"] == "1":
 thermalctld File "/usr/lib/python2.7/UserDict.py", line 40, in __getitem__
 thermalctld raise KeyError(key)
 thermalctld KeyError: 'THERMALCTLD_UNIT_TESTING'

Also fixed the same issue in chassisd.

Signed-off-by: Petro Bratash [email protected]

[bratashX]

@akokhan, please review

[bratashX]

@jleveque CI failure when update submodule: sonic-net/sonic-buildimage#5945
Could you please say how to run this unit-tests manually?

=================================== FAILURES ===================================
______________________ test_updater_thermal_check_min_max ______________________

    def test_updater_thermal_check_min_max():
        chassis = MockChassis()
    
        thermal = MockThermal()
        chassis.get_all_thermals().append(thermal)
    
        chassis.set_modular_chassis(True)
        chassis.set_my_slot(1)
        temperature_updater = TemperatureUpdater(SYSLOG_IDENTIFIER, chassis)
    
        temperature_updater.update()
        slot_dict = temperature_updater.chassis_table.get('Thermal 1')
>       assert slot_dict['minimum_temperature'] == str(thermal.get_minimum_recorded())
E       TypeError: 'NoneType' object has no attribute '__getitem__'

tests/test_thermalctld.py:341: TypeError
===================== 1 failed, 16 passed in 0.36 seconds ====================

[jleveque]

@bratashX: You should be able to follow the instructions for sonic-utilities, but reference the thermalctld package instead: https://github.com/Azure/sonic-utilities/blob/master/README.md#setting-up-a-buildtest-environment.

[bratashX]

@bratashX: You should be able to follow the instructions for sonic-utilities, but reference the thermalctld package instead: https://github.com/Azure/sonic-utilities/blob/master/README.md#setting-up-a-buildtest-environment.

@jleveque, thanks