Add RBAC and Tagging Support to Ansible Credentials

[hstastna]

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1526219
Needs to merge with: ManageIQ/manageiq#17079

---

Done:

• add Policy toolbar button to access tagging in Automation > Ansible > Credentials
  (Policy > Edit Tags)
• add tagging_edit and tag_edit_form_field_changed to routes to enable tagging for Ansible Credentials or for proper rendering of tagging screen
• add calling tag method to button method in ansible credential controller and also small refactoring of button method, in that controller
• display tags in the table in summary page of any credential
• make tagging work also from summary page of any credential
• check if RBAC works
• spec test for button method in ansible credential controller

Before:

After:

Note:
How to check RBAC support (one of possible scenarios):

1. as an admin, tag some credential(s) from Automation > Ansible > Credentials,
   remember those tags
2. in Configuration > Access Control > Groups, create a group so that under Assigned Filters in the first tab called My Company Tags, you choose the same tags from step 1.
3. set EvmRole-administrator as a role of that group (not super administrator!) and save the group
4. create a user with that group from step 3.
5. logout and login as the user from step 4.
6. go to Automation > Ansible > Credentials and you should see only credentials with the same tags as from step 2.

[hstastna]

@miq-bot add_label blocker

[hstastna]

@miq-bot add_label gaprindashvili/yes

[hstastna]

@h-kataria @dclarizio @martinpovolny Adding RBAC and Tagging Support to Ansible Credentials done so now I would need some review. Thanks so much! :)

[miq-bot]

Checked commits hstastna/manageiq-ui-classic@2900b7e~...9586334 with ruby 2.3.3, rubocop 0.52.0, haml-lint 0.20.0, and yamllint 1.10.0
6 files checked, 0 offenses detected
Everything looks fine. 🍰

[h-kataria]

ManageIQ/manageiq#17079 is merged.

[h-kataria]

looks good.

[simaishi]

Gaprindashvili backport details:

$ git log -1
commit a8b59877c58085845f726176a9a126c509dd4986
Author: Harpreet Kataria <[email protected]>
Date:   Mon Mar 5 17:12:00 2018 -0500

    Merge pull request #3507 from hstastna/Add_RBAC_Tagging_Ansible_Credentials_ui
    
    Add RBAC and Tagging Support to Ansible Credentials
    (cherry picked from commit f45a79b793d8578aa8583191b30ed3c32bda5e1c)
    
    Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1553393

[hstastna]

@miq-bot add_label test