'setup_repositories' task had 'upload_core_repos' name in 7.0
release. Anyway, it's not necessary to specify this task in
tasks set as it's running on all nodes(the same for 'setup_repos'
task in >7.0 releases).
Change-Id: I5974b0453ce5d3a09a9036e3c570a5263a8a2aa9
Closes-Bug: #1539611