Fix typos in the configuration documentation

Change-Id: I0089c195f4cda313c3b68a7c5c215b9dbff94db2
Horizon front page test fix

Fixes the test string in horizon front page test so it is not failing
when header tag gets new attributes

Change-Id: Ibf62bf6f6300eeb0ab2f22086b0ff1c05c69d86b
Merge "Horizon front page test fix"
Merge "Fix typos in the configuration documentation"
Merge branch 'master' of https://github.com/openstack-dev/devstack