Render flash when running compliance check for a container node 🐞

[skateman]

We were rendering a blank page after the compliance check for a container node has been initiated. This PR forces the flash rendering as there's always a positive/negative message to be displayed.

https://bugzilla.redhat.com/show_bug.cgi?id=1516864

[miq-bot]

Checked commit skateman@9a7a01f with ruby 2.3.3, rubocop 0.47.1, haml-lint 0.20.0, and yamllint 1.10.0
2 files checked, 1 offense detected

spec/controllers/container_node_controller_spec.rb

• ❗ - Line 57, Col 9 - Rails/HttpPositionalArguments - Use keyword arguments instead of positional arguments for http call: post.

[simaishi]

Gaprindashvili backport details:

$ git log -1
commit 99e1b1aaabd8f4a9ab5d0c77d068321cadea3783
Author: Milan Zázrivec <[email protected]>
Date:   Tue Nov 28 10:58:22 2017 +0100

    Merge pull request #2841 from skateman/container-node-flash
    
    Render flash when running compliance check for a container node <U+1F41E>
    (cherry picked from commit 2566672ba22c3f4e59369b87ddcb4a03940efa52)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1518332