Provide annotations to exclude reloading resources

[LochanRn]

This PR fixes : #740

Provide annotations to exclude reloading resources based on the annotation set on the owner resources.
Exclude Configmaps Annotation: configmaps.exclude.reloader.stakater.com/reload
Exclude Secrets Annotation: secrets.exclude.reloader.stakater.com/reload

Example for excluding nginx-cm-1,nginx-cm-2 configmap in a deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    configmaps.exclude.reloader.stakater.com/reload: "nginx-cm-1,nginx-cm-2"
spec:
  template: 
    metadata:
...

Example for excluding nginx-secret secret in a deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    secrets.exclude.reloader.stakater.com/reload: nginx-secret
spec:
  template: 
    metadata:
...

[karl-johan-grahn]

@LochanRn I think we need unit tests for this - test for both the positive and negative use cases

[LochanRn]

@karl-johan-grahn PTAL added test cases.