Force array context for VMs, hosts, vnets and images

[djberg96]

Addresses an issue where a single VM, host, vnet or image would not be interpreted in array context, which breaks our refresh parser. Add @() forces the issue. We already did this for clusters, and should do it for the other types of resources as well.

Addresses https://bugzilla.redhat.com/show_bug.cgi?id=1474404

[djberg96]

@miq-bot add_label fine/yes

[simaishi]

Fine backport (to manageiq repo) details:

$ git log -1
commit 6d85537f04da62e2565aba929922f5a0028877cd
Author: Bronagh Sorota <bsorota@redhat.com>
Date:   Tue Aug 1 10:18:18 2017 -0400

    Merge pull request #13 from djberg96/powershell_script
    
    Force array context for VMs, hosts, vnets and images
    (cherry picked from commit 5cfc104942f4a4c5f48478e000cfc9b73f71b72f)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1479972