[QGIS-Developer] PyQgsOfflineEditingWFS and WFS Provider test ABOUT to be blacklisted from Travis

[Nyall Dawson]

Following the conversation from
https://github.com/qgis/QGIS/commit/89d4998 , this is an announcement
to notify that the PyQgsOfflineEditingWFS and the WFS Provider test
are on final notice and about to be blacklisted from the Travis CI
infrastructure.

Work has been underway to remove "noisy" tests from Travis which cause
false alarms and these tests regularly fail for unrelated changes.
False alarms are bad as they undermine confidence in the CI results
and encourage contributors to ignore the test results.

These tests are consistently failing (about 30% of the time) for
unrelated changes.

If you're interested in seeing these tests continue as part of the CI
infrastructure here are some examples of typical random failures these
tests encounter:

https://travis-ci.org/qgis/QGIS/jobs/401106522

Those tests have been warned...

Nyall