Fix assigning roles in group form

[lpichler]

Rbac.filtered doesn't accept integer there is Rbac.filtered_object for this purposes.

Reproducer
edit any Group in access control
change role and
it is causing error:

[----] F, [2017-02-03T09:17:17.212149 #74779:3fd82712598c] FATAL -- : Error caught: [NoMethodError] undefined method `all' for 1000000000009:Fixnum
/Users/liborpichler/manageiq/manageiq/lib/rbac/filterer.rb:209:in `search'
/Users/liborpichler/manageiq/manageiq/lib/rbac/filterer.rb:112:in `search'
/Users/liborpichler/manageiq/manageiq/lib/rbac.rb:3:in `search'
/Users/liborpichler/manageiq/manageiq/lib/rbac/filterer.rb:280:in `filtered'
/Users/liborpichler/manageiq/manageiq/lib/rbac/filterer.rb:116:in `filtered'
/Users/liborpichler/manageiq/manageiq-ui-classic/app/controllers/ops_controller/ops_rbac.rb:1035:in `valid_role?'
/Users/liborpichler/manageiq/manageiq-ui-classic/app/controllers/ops_controller/ops_rbac.rb:1048:in `rbac_group_get_form_vars'
/Users/liborpichler/manageiq/manageiq-ui-classic/app/controllers/ops_controller/ops_rbac.rb:796:in `rbac_field_changed'
/Users/liborpichler/manageiq/manageiq-ui-classic/app/controllers/ops_controller/ops_rbac.rb:254:in `rbac_group_field_changed'

cc @mzazrivec
@miq-bot add_label ui, bug

@miq-bot assign @martinpovolny

[miq-bot]

Checked commits lpichler/manageiq-ui-classic@38d428d~...2240de9 with ruby 2.2.6, rubocop 0.47.1, and haml-lint 0.20.0
1 file checked, 0 offenses detected
Everything looks good. 🍰

[martinpovolny]

To be backported together with #271.

[martinpovolny]

https://bugzilla.redhat.com/show_bug.cgi?id=1418662

[lpichler]

@simaishi this is part of
EUWE BZ https://bugzilla.redhat.com/show_bug.cgi?id=1419686

[simaishi]

Euwe backport (to manageiq repo) details:

$ git log -1
commit f291f3c9da6682504e25bfba3744e8b10cd33a00
Author: Martin Povolny <mpovolny@redhat.com>
Date:   Fri Feb 3 16:46:32 2017 +0100

    Merge pull request #296 from lpichler/fix_assigning_roles
    
    Fix assigning roles in group form
    (cherry picked from commit 40f8a76205f7b6cac2a0cfd9c97a6a141623552a)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1419686