Add in experimental job to test zuul swift pushing

Create a new job template 'experimental-swift-logs-{name}-pep8'
which is identical to 'gate-{name}-pep8' except it contains no
publishers and instead uses zuul_swift_upload_console_log builder to
send the logs to swift.

Change-Id: I19f57227934a5d53e7e2c9fc716f89300f40377e
Merge "Add in experimental job to test zuul swift pushing"