Train was the last release supporting python2. Let's rip the bandaid
off.
Also includes remove tripleo jobs from os-collect-config master
Partial-Bug: #1879361
Co-Authored-By: xuanyandong <xuanyandong@inspur.com>
Co-Authored-By: Alex Schultz <aschultz@redhat.com>
Change-Id: I46c79ce87f474a986f1983fa9164e6e4cbeaf8de