Temporarily disable doctor-notification

Temporarily disable doctor-notification

It's currently forbidding gating all APEX' scenarios [1] (even
os-nosdn-nofeature-* [2]). It will be enabled when it's fixed or when
functest jobs are rewritten [3]

[1] https://build.opnfv.org/ci/view/functest/job/functest-apex-baremetal-daily-master/772/console
[2] https://build.opnfv.org/ci/view/functest/job/functest-apex-baremetal-daily-master/770/console
[3] https://gerrit.opnfv.org/gerrit/#/c/51853/

Change-Id: I571c464aabe02f67a9e98ca1ab42d8a7efc672ee
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>