Reword Get Roles to Get Groups from Home Forest.

[jvlcek]

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1475891

This is a very simple PR that will clarify what is being retrieved when a checkbox is activated.

The wording of the authorization checkbox titled: Get Roles from Home Forest is confusing
for a couple of reasons.

1. It causes Groups not Roles to be retrieved.
2. The term Forest, although a bit misleading to AD purists, was likely chosen initially due to the similarity to the functionality for LDAP and AD. Since the term Forest has been used generically here it will stay.

The term Roles is not correct and will be changed to Groups

Steps for Testing/QA

Navigate to Configuration->Authentication and select mode LDAP or LDAPS
Check the box Get User Groups from LDAP
Note the wording of the next checkbox has been update to Get Groups from Home Forest

[jvlcek]

@miq-bot add_label bug

[jvlcek]

@miq-bot add_label settings

[jvlcek]

@dclarizio Can you please review or assign this to someone?

Thank you! JoeV

[miq-bot]

Checked commit jvlcek@64d01df with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
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