Bug 22227: Make GET /cities staff only

Bug 22227: Make GET /cities staff only

This patch removes the possibility to access the city objects without
privileged access (minimum permissions == catalogue).

It does so by adding the required permissions to the spec. The tests are
adjusted.

To test:
- Apply this patch
- Run:
  $ kshell
 k$ prove t/db_dependent/api/v1/cities.t
=> SUCCESS: Tests pass!
- Sign off :-D

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>