Ensure that options[:ems_id] is an Array when passed as an ENV var

[agrare]

When passing the EMS_ID as an ENV var we need to ensure that it is an array to be consistent with how OptionParser is processing it

Longer term we should be able to drop EMS_ID as an array now that #20345 is passing the parent manager ems_id only for the queue_name.

[miq-bot]

Checked commit agrare@5b609bb with ruby 2.6.3, rubocop 0.82.0, haml-lint 0.35.0, and yamllint
1 file checked, 0 offenses detected
Everything looks fine. 👍

[agrare]

@gtanzillo @jrafanie can we mark this kasparov/yes

[jrafanie]

@gtanzillo @jrafanie can we mark this kasparov/yes

Yes. 💯

[agrare]

cc @simaishi

[simaishi]

Kasparov backport details:

$ git log -1
commit efe017f4272237a48c2ba3214ac5fcbd43f31b73
Author: Joe Rafaniello <jrafanie@users.noreply.github.com>
Date:   Thu Nov 12 16:08:23 2020 -0500

    Merge pull request #20809 from agrare/fix_ems_workers_ems_id_non_array

    Ensure that options[:ems_id] is an Array when passed as an ENV var

    (cherry picked from commit 8ac612f334c88d7a33eab7531537ba65eb5447a9)