Fix pylint warnings in test_odl
Fix pylint warnings in test_odl

It takes into account the following warnings:
  - wrong-import-order
  - bad-continuation
  - unused-argument
  - invalid-name
  - too-many-arguments

missing-docstring is partially disabled as they are unit tests.

It has been rated at 10.00/10.

Change-Id: I35886ec75a9e66817cfd0fe18534f157d7500a2b
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

opnfv/functest,mywulin/functest,opnfv/functest,mywulin/functest