fix(analytics): respect environment variable to disable reporting event analytics

[emosbaugh]

Pull Request template

Why is this PR required? What issue does it fix?:

Fixes #210

What this PR does?:

Environment variable OPENEBS_IO_ENABLE_ANALYTICS is only respected for sending on a schedule. This disables event sending.

Does this PR require any upgrade changes?:

No

If the changes in this PR are manually verified, list down the scenarios covered::

Any additional information for your reviewer? :
Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• Fixes Unable to disable analytics reporting #210
• PR Title follows the convention of <type>(<scope>): <subject>
• Has the change log section been updated?
• Commit has unit tests
• Commit has integration tests
• (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• (Optional) If documentation changes are required, which issue on https://github.com/openebs/openebs-docs is used to track them:

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.35%. Comparing base (cab53c4) to head (0701fed).
Report is 9 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #211      +/-   ##
===========================================
- Coverage    37.91%   37.35%   -0.57%     
===========================================
  Files           36        1      -35     
  Lines         3373      779    -2594     
===========================================
- Hits          1279      291     -988     
+ Misses        2012      479    -1533     
+ Partials        82        9      -73     

Flag	Coverage Δ
integrationtests	37.35% <ø> (?)

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