Description of problem:
If you grant a user the "register system" permission, and he only knows the *name* of the environment he wishes to register to, he cannot register.  The API to look up the ID of the environment is off-limits.

Version-Release number of selected component (if applicable):
katello-0.1.115-1.git.4.fc070ec.el6.x86_64

How reproducible:


Steps to Reproduce:
1. Create a role with perm Global/Organizations/Register System only, and assign a user to only this role
2. Try to register with RHSM (or at a lower level, try to look up the ID of the environment via the API)
3.
  
Actual results:
cannot register

Expected results:
register succeeds

Additional info:

[root@katello-test-rhel6-1 ca]# subscription-manager register --username user-perm-1322498127482 --password password --org ACME_Corporation --env Development
User user-perm-1322498127482 is not allowed to access api/environments/index

Started GET "/katello//api/organizations/ACME_Corporation/environments?name=Development" for 10.16.120.31 at Mon Nov 28 11:35:45 -0500 2011
  Processing by Api::EnvironmentsController#index as JSON
  Parameters: {"name"=>"Development", "organization_id"=>"ACME_Corporation"}
Errors::SecurityViolation: User user-perm-1322498127482 is not allowed to access api/environments/index
/usr/share/katello/lib/authorization_rules.rb:31:in `authorize'
/usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:448:in `_run__856191886__process_action__199225275__callbacks'
/usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:221:in `_conditional_callback_around_2122'
/usr/share/katello/lib/util/threadsession.rb:79:in `thread_locals'
/usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:220:in `_conditional_callback_around_2122'
/usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:441:in `_run__856191886__process_action__199225275__callbacks'
/usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:410:in `send'