Commits on Oct 5, 2021

1. Support changing pod collector annotations …

   This allows setting podAnnotations, e.g:
   ```
   ---
   apiVersion: opentelemetry.io/v1alpha1
   kind: OpenTelemetryCollector
   metadata:
     name: opentelemetry
     annotations:
       foo: "this won't be applied to pods"
   spec:
     mode: deployment
     podAnnotations:
       ad.datadoghq.com/otc-container.check_names: '["openmetrics"]'
       ad.datadoghq.com/otc-container.init_configs: '[{}]'
       ad.datadoghq.com/otc-container.instances: |-
         [
           {
             "prometheus_url": "http://%%host%%:8888/metrics",
             "namespace": "opentelemetry.collector",
             "metrics": [
               {"otelcol_exporter_queue_size": "exporter.queue_size"},
               {"otelcol_exporter_send_failed_spans": "exporter.send_failed_spans"},
               {"otelcol_exporter_sent_spans": "exporter.sent_spans"},
             ]
           }
         ]
     # ...
   ```
   
   Fixes open-telemetry#426

   

   indrekj committed Oct 5, 2021
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