Get all user form data before validating for errors per field

[ZitaNemeckova]

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1562828

Configuration -> Access Control -> Users -> Configuration -> Add a new User -> fill as in image below -> click Add

Before:

After:

Makes sure not to re-introduced bug fixed in #3345

Steps to reproduce issue from that PR:

• Create an RBAC user that is assigned to one or more groups
• Edit the RBAC user and remove them from all of their assigned groups
• Click Save
• After receiving the error "A User must be assigned to a Group", navigate away from the user's details page.
• Select the user in the RBAC accordion to view their details

If there's an error make sure it isn't related to #3720 fix

@miq-bot add_label bug, gaprindashvili/yes, wip

[ZitaNemeckova]

@miq-bot add_label wip

[miq-bot]

Checked commits ZitaNemeckova/manageiq-ui-classic@09aa3f9~...7699935 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. 👍

[ZitaNemeckova]

@miq-bot remove_label wip

[himdel]

@ZitaNemeckova This breaks editing users in ops ;).

rbac_user_set_record_vars(record) needs to be called even whan saving an existing user :)

(Removed gaprindashvili/yes until this is fixed.)

[ZitaNemeckova]

Replaced/Fixed by #3767

[himdel]

@simaishi When backporting to gaprindashvili, please backport together with #3767 :)