Deployment check patch4

[jonnydawg]

This change addresses various things:

• Respect race conditions when checker pod starts up by utilizing KH_CHECK_RUN_DEADLINE -- described in Add new CHECK_START_TIME environment variable to checker pods #380 and issue 380 - env check for start time  #386
• Add a function to pull KH_CHECK_RUN_DEADLINE from the environment variables
• Report back to Kuberhealthy on the current state of the check when given interrupt / kill signal
• Respect custom resource requests and limits on the deployment pods that are brought up during the deployment check described in Resource Limits #395 (adds CHECK_POD_CPU_REQUEST, CHECK_POD_CPU_LIMIT, CHECK_POD_MEM_REQUEST, CHECK_POD_MEM_LIMIT)

[joshulyne]

Remove CHECK_TIME_LIMIT:

• https://github.com/Comcast/kuberhealthy/blob/deployment-check-patch4/deploy/helm/kuberhealthy/templates/khcheck-deployment.yaml
• All kuberhealthy flat file specs: https://github.com/Comcast/kuberhealthy/blob/deployment-check-patch4/deploy/

other than that, lgtm 👍

[jonnydawg]

https://hub.docker.com/layers/kuberhealthy/deployment-check/v1.4.0/images/sha256-791a3de6c57dea569646d1d3b3e195d6f98a879cb98151db9983a2a8d5058081?context=repo