Fix selection of a node in Snapshot tree

[ZitaNemeckova]

https://bugzilla.redhat.com/show_bug.cgi?id=1398239

Before:
node is not selected at init

After:
node is selected at init

• selection of a node
• lazy loading will be solved for every tree by tree_autoload - don't assume we're always autoloading the active tree #12986

@miq-bot add_label wip, ui, bug, euwe/yes

[ZitaNemeckova]

@miq-bot remove_label wip

[ZitaNemeckova]

@miq-bot add_label blocker

[h-kataria]

@ZitaNemeckova i still see same issue on snapshots tree screen, on initial load of screen, a non-active snapshot is selected and Create a new Snapshot button is enabled, see the attached screenshot. Second issue is still there where the node with Active snapshot is not getting expanded, clicking on the arrow doesn't load children under that node.
snapshots tree after the fix:

[ZitaNemeckova]

@h-kataria First issue solved. Second should be resolved by #12986. I checked and it works for me. Thanks for review :)

[dclarizio]

@ZitaNemeckova there's a relevant spec failure, please take a look.

[mzazrivec]

I'm adding a wip label, until the CI failure is resolved.

[miq-bot]

Checked commits ZitaNemeckova/manageiq@218fa2f~...406bae0 with ruby 2.2.5, rubocop 0.37.2, and haml-lint 0.16.1
4 files checked, 0 offenses detected
Everything looks good. 🏆

[ZitaNemeckova]

@miq-bot remove_label wip

[h-kataria]

retested, verified fix.

[chessbyte]

Euwe BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1402991

[chessbyte]

Euwe Backport details:

$ git log -1
commit 18fdbd6d3447d420e02d4da1d6f7c37f75242a43
Author: Dan Clarizio <dclarizi@redhat.com>
Date:   Thu Dec 8 11:35:38 2016 -0500

    Merge pull request #12980 from ZitaNemeckova/snapshot_fix
    
    Fix selection of a node in Snapshot tree
    (cherry picked from commit a49537249c11edeb3c9a606a36da6d96c72b65ba)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1402991