Application update events don't trigger zync when first*traffic_at fields are updated

[Martouta]

Fixes THREESCALE-2072 - Application update events trigger zync when first*traffic_at fields are updated

[codecov]

Codecov Report

Merging #753 into master will decrease coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #753      +/-   ##
==========================================
- Coverage   92.93%   92.86%   -0.07%     
==========================================
  Files        2395     2392       -3     
  Lines       78189    77861     -328     
==========================================
- Hits        72663    72304     -359     
- Misses       5526     5557      +31

Impacted Files	Coverage Δ
app/models/cinstance.rb	96.51% <100%> (+0.02%)	⬆️
test/unit/cinstance_test.rb	100% <100%> (ø)	⬆️
.../initializers/backport_pg_10_support_to_rails_4.rb	30% <0%> (-50%)	⬇️
config/initializers/postgres.rb	50% <0%> (-50%)	⬇️
lib/tasks/multitenant/tenants.rake	53.84% <0%> (-46.16%)	⬇️
config/initializers/access_token_authentication.rb	55.55% <0%> (-22.23%)	⬇️
app/models/application_record.rb	62.5% <0%> (-18.75%)	⬇️
app/queries/new_accounts_query.rb	71.73% <0%> (-10.87%)	⬇️
lib/tasks/impersonation_admin_user.rake	90% <0%> (-10%)	⬇️
app/lib/three_scale/api/responder.rb	95.74% <0%> (-2.13%)	⬇️
... and 4 more

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[Martouta]

It was passing tests, codeclimate, and approved by Gui. I repushed only for this, so I am merging it now since it is the exact same code 😄