Remove one obsolete test in test_odl.py
Remove one obsolete test in test_odl.py

It completes "Create RobotFramework class" [1] which decreased
coverage to 99% (test_odl.py)

[1] https://gerrit.opnfv.org/gerrit/#/c/47841/

Change-Id: I2a2d448daeb6d1f50064588167cafd32e07aa502
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

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