[api] Add ppc64le architecture

This commit adds PowerPC64 Little Endian architecture

Signed-off-by: Dinar Valeev <dvaleev@suse.com>
[api] relax the suse repo publish test a bit, test only the important stuff
[api] remove one more threadsafe measure that's hurting us
[webui] import tooltip css after talking with Henne
[webui] move the "add review" link out of the decision box

The permissions of accept/revoke are independent of reviews
[webui] switch capybara driver to poltergeist

This is the net result of 8 months watching capybara-webkit#494 not getting
fixed