Lazily initialize kubernetes client only when using kube api watcher

[jeevb]

TL;DR

Lazily load k8s client only in kubeapi watcher. This prevents init container errors when running with service accounts that have automountServiceAccountToken: false set. Smoke tested in sandbox with and without automountServiceAccountToken: false, with both the default shared process namespace watcher and kubeapi watcher respectively.

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

Moved initialization of k8s client from copilot root command to NewKubeAPIWatcher function. Now it is only initialized when the kube-api watcher is specified.

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[codecov]

Codecov Report

Merging #56 (08bbbb5) into master (97772fd) will increase coverage by 0.91%.
The diff coverage is n/a.

❗ Current head 08bbbb5 differs from pull request most recent head 8cc786e. Consider uploading reports for the commit 8cc786e to get more accurate results

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage   16.87%   17.79%   +0.91%     
==========================================
  Files           3        3              
  Lines         474      399      -75     
==========================================
- Hits           80       71       -9     
+ Misses        381      315      -66     
  Partials       13       13              

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see 3 files with indirect coverage changes

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