Adds custom iSCSIadm ConfigMap and HostPID options

Tackles issue openebs-archive#207. Adds the ability to enable HostPID: true for the csi Node DaemonSet.
It also adds the ability to inject a custom configuration in to the hardcoded `openebs-jiva-csi-iscsiadm` ConfigMap.

These changes are pretty small but ensures that the Jiva Operator can more easily be used with (Talos)[https://www.talos.dev/].
Talos requires some modifications for it to work properly with Talos.
Details here: https://www.talos.dev/v1.6/kubernetes-guides/configuration/replicated-local-storage-with-openebs-jiva/#patching-the-jiva-installation

Signed-off-by: Leo Palmer Sunmo <leo.sunmo@gmail.com>

deploy/helm/charts/templates/csi-iscsiadm-config.yaml

@@ -4,6 +4,9 @@ metadata:
   name: openebs-jiva-csi-iscsiadm
 data:
   iscsiadm: |
+  {{- if .Values.csiNode.customIscsiadmConfig }}
+    {{- .Values.csiNode.customIscsiadmConfig | nindent 4 }}
+  {{- else }}
     #!/bin/sh
     if [ -x /host/sbin/iscsiadm ]; then
       chroot /host /sbin/iscsiadm "$@"
@@ -16,3 +19,4 @@ data:
     else
       chroot /host iscsiadm "$@"
     fi
+  {{- end }}

deploy/helm/charts/templates/csi-node.yaml

@@ -22,6 +22,7 @@ spec:
       priorityClassName: {{ template "jiva.csiNode.priorityClassName" . }}
       serviceAccountName: {{ .Values.serviceAccount.csiNode.name }}
       hostNetwork: true
+      hostPID: {{ .Values.csiNode.hostPID }}
       containers:
         - name: {{ .Values.csiNode.driverRegistrar.name }}
           image: "{{ .Values.csiNode.driverRegistrar.image.registry }}{{ .Values.csiNode.driverRegistrar.image.repository }}:{{ .Values.csiNode.driverRegistrar.image.tag }}"

deploy/helm/charts/values.yaml

@@ -127,6 +127,12 @@ csiNode:
     name: jiva-csi-node-critical
     value: 900001000
   componentName: "openebs-jiva-csi-node"
+  hostPID: false
+  # customIscsiadmConfig is used to override the default iscsiadm config
+  # customIscsiadmConfig: |
+  #   #!/bin/sh
+  #   iscsid_pid=$(pgrep iscsid)
+  #   nsenter --mount="/proc/${iscsid_pid}/ns/mnt" --net="/proc/${iscsid_pid}/ns/net" -- /usr/local/sbin/iscsiadm "$@"
   logLevel: "5"
   driverRegistrar:
     name: "csi-node-driver-registrar"