Disable temporarily Doctor from Functest

Disable temporarily Doctor from Functest

The test case is currently failing whatever the scenario/installer

It is misleading for some scenarios (e.g. barometer)
As it is systematically failing for the moment, it makes more sense
to disable the test rather than complexify regex constraints

The test case will be reenabled when the following points will be fixed:
- Python 3 support (pending question to Release Manager)
- packaging OK: pending patches [1] [2] (need merge of [1])
- remove packet installation in run

[1] https://gerrit.opnfv.org/gerrit/#/c/38177/
[2] https://gerrit.opnfv.org/gerrit/#/c/38053/

Change-Id: Ic06786f0d516f1702dc44dc521ba8ca810ee76f9
Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>