celestica: reallocate the empty LIST at the constructor of subclasses

[ds952811]

While this is part of the following PR, it will do no harm even if the
PR is rejected

sonic-net/sonic-platform-common#65

Signed-off-by: Dante Su dante.su@broadcom.com

- What I did
Calling superclass.__init__() at the beginning the constructor

- How I did it
Move the superclass.__init__() to the beginning of the constructor

- How to verify it
It does not make any difference if PR#65 to sonic-platform-common is not in place,
and it could be verified with the following scripts when the PR#65 is merged

# source /host/machine.conf
# export PYTHONPATH=/usr/share/sonic/device/$onie_platform
# vi test.py
--------------------------------------------------------------------------------------
#!/usr/bin/env python

import sonic_platform.platform

chassis = sonic_platform.platform.Platform().get_chassis()
if chassis is None:
    print("Error getting chassis!")
    sys.exit(1)

print("FAN number: {}".format(chassis.get_num_fans()))

chassis = sonic_platform.platform.Platform().get_chassis()
if chassis is None:
    print("Error getting chassis!")
    sys.exit(1)

print("FAN number: {}".format(chassis.get_num_fans()))
--------------------------------------------------------------------------------------

# chmod +x test.py
# ./test.py

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