This better sets expectatations for the fact that in Zulip, the
Organization settings UI is available read-only to non-administrator
users.
Tweaked by tabbott to update some additional references.
The casper test file 10-admin.js had gotten to be super huge, so a
split is a good idea regardless, but this should also make quaranteen
for tests broken by the settings redesign more manageable.
Brock Whittaker
digi0ps
Abhijeet Kaur
Umair Khan
Tim Abbott