Add support for custom pod properties to crd

[tbondarchuk]

Currently there are no way to pass custom pod configs via crds, like nodeSelector/tolerations/topologySpreadConstraints/affinity/etc (unless I'm missing something?)

There is only arch/zone/region though not sure what exactly they configure, labels?

[tbondarchuk]

Was able to trace to here:

fabric-operator/pkg/offering/base/peer/override/deployment.go

Line 799 in 03d6f43

nodeSelectorTerms := common.GetNodeSelectorTerms(arch, zone, region)

nothing for toleration or custom labels for nodeSelector.

Also - sample-network creates pods with quite inconsistent affinity:

ca

          podAntiAffinity:
            preferredDuringSchedulingIgnoredDuringExecution:
            - podAffinityTerm:
                labelSelector:
                  matchExpressions:
                  - key: app
                    operator: In
                    values:
                    - org0-ca
                topologyKey: topology.kubernetes.io/zone
              weight: 100
            - podAffinityTerm:
                labelSelector:
                  matchExpressions:
                  - key: app
                    operator: In
                    values:
                    - org0-ca
                topologyKey: failure-domain.beta.kubernetes.io/zone
              weight: 100

orderer

        affinity:
          podAntiAffinity:
            preferredDuringSchedulingIgnoredDuringExecution:
            - podAffinityTerm:
                labelSelector:
                  matchExpressions:
                  - key: orgname
                    operator: In
                    values:
                    - OrdererOrg
                topologyKey: kubernetes.io/hostname
              weight: 100

peer

        affinity:
          podAntiAffinity:
            preferredDuringSchedulingIgnoredDuringExecution:
            - podAffinityTerm:
                labelSelector:
                  matchExpressions:
                  - key: orgname
                    operator: In
                    values:
                    - Org1MSP
                topologyKey: kubernetes.io/hostname
              weight: 100