WIP: IAM auth for db

[katrogan]

Read then delete

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• Use #patch, #minor or #major in the pull-request title to bump the corresponding version. Otherwise, the patch version
  will be bumped. More details

TL;DR

Please replace this text with a description of what this PR accomplishes.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

https://github.com/lyft/flyte/issues/

Follow-up issue

NA
OR
https://github.com/lyft/flyte/issues/

[codecov-commenter]

Codecov Report

Merging #125 into master will decrease coverage by 0.44%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   62.26%   61.82%   -0.45%     
==========================================
  Files         105      105              
  Lines        7845     7901      +56     
==========================================
  Hits         4885     4885              
- Misses       2385     2441      +56     
  Partials      575      575              

Flag	Coverage Δ
#unittests	61.82% <0.00%> (-0.45%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/repositories/config/postgres.go	15.62% <0.00%> (-26.05%)	⬇️
pkg/runtime/application_config_provider.go	4.25% <0.00%> (-2.20%)	⬇️

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