Container Config addition

[markstubb]

Adding the ability to specify scand-agent resources and securityContexts via podconfig input file.
the input file format for podconfig will now have an additional context of 'container' as so:

containers:
  - securityContext:
      runAsUser: 1000
    resources:
      limits:
        cpu: "1"
        memory: "512Mi"

This allows the end user to specify securityContext as well as resource limits on the launched scand-agent containers