feat: netapp-volume-worker support (rackerlabs#527)

This creates a new Kustomize deployment for cinder with a netapp volume
backend. The worker uses an existing cinder deployment managed by helm
kustomizes the configuration values and produces a netapp specific volume
container which has the ability to run with multiple netapp backends.

To use this container the following secret must be created

``` shell
kubectl --namespace openstack \
        create secret generic cinder-netapp \
        --type Opaque \
        --from-literal=BACKENDS="netapp-backend-1,root,10.0.0.1,80,vserver1,qos-something,True,True,True,True,enabled"
```

Each backend has 11 values which correspond to the needed configuration.
Multiple backends are supported using a semicolon.

Signed-off-by: Kevin Carter <[email protected]>

.github/workflows/kustomize-cinder-volume-netapp.yaml

@@ -0,0 +1,28 @@
+name: Kustomize GitHub Actions for cinder-volume-netapp
+
+on:
+  pull_request:
+    paths:
+      - base-kustomize/cinder/netapp/**
+      - .github/workflows/kustomize-cinder-volume-netapp.yaml
+jobs:
+  kustomize:
+    name: Kustomize
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Kustomize Install
+        working-directory: /usr/local/bin/
+        run: |
+          if [ ! -f /usr/local/bin/kustomize ]; then
+            curl -s "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh" | sudo bash
+          fi
+      - name: Run Kustomize Build
+        run: |
+          kustomize build base-kustomize/cinder/netapp/ > /tmp/rendered.yaml
+      - name: Return Kustomize Build
+        uses: actions/upload-artifact@v4
+        with:
+          name: kustomize-cinder-volume-netapp-artifact
+          path: /tmp/rendered.yaml

base-kustomize/cinder/netapp/configmap-etc.yaml

@@ -0,0 +1,53 @@
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: cinder-volume-netapp-config
+  namespace: openstack
+data:
+  cinder-volume.sh: |
+    #!/bin/bash
+    set -ex
+    exec cinder-volume --config-file /etc/cinder/cinder.conf \
+                       --config-file /tmp/pod-shared/backends.conf \
+                       --config-file /tmp/pod-shared/internal_tenant.conf \
+                       --config-file /tmp/pod-shared/cinder-netapp.conf
+  generate-backends.py: |
+    #!/usr/bin/env python3
+    import configparser
+    import os
+    netapp_backends = os.environ.get('NETAPP_BACKENDS')
+    config = configparser.ConfigParser()
+    for backend in netapp_backends.split(';'):
+        backend = backend.split(',')
+        assert len(backend) == 11
+        config.add_section(backend[0])
+        config.set(backend[0], 'netapp_login', backend[1])
+        config.set(backend[0], 'netapp_password', backend[2])
+        config.set(backend[0], 'netapp_server_hostname', backend[3])
+        config.set(backend[0], 'netapp_server_port', backend[4])
+        config.set(backend[0], 'netapp_storage_family', 'ontap_cluster')
+        config.set(backend[0], 'netapp_storage_protocol', 'iscsi')
+        config.set(backend[0], 'netapp_transport_type', 'http')
+        config.set(backend[0], 'netapp_vserver', backend[5])
+        config.set(backend[0], 'netapp:qos_policy_group', backend[6])
+        config.set(backend[0], 'netapp_dedup', backend[7])
+        config.set(backend[0], 'netapp_compression', backend[8])
+        config.set(backend[0], 'netapp_thick_provisioned', backend[9])
+        config.set(backend[0], 'netapp_lun_space_reservation', backend[10])
+        config.set(backend[0], 'volume_driver', 'cinder.volume.drivers.netapp.common.NetAppDriver')
+        config.set(backend[0], 'volume_backend_name', backend[0])
+        print(f'Added backend {backend[0]}')
+    with open('/tmp/pod-shared/backends.conf', 'w') as configfile:
+        config.write(configfile)
+    print('Generated backends.conf')
+
+    config = configparser.ConfigParser()
+    backends = ','.join([i.split(',')[0] for i in netapp_backends.split(';')])
+    config.set('DEFAULT', 'enabled_backends', backends)
+    config.set('DEFAULT', 'host', 'cinder-volume-netapp-worker')
+    with open('/tmp/pod-shared/cinder-netapp.conf', 'w') as configfile:
+        config.write(configfile)
+    print('Updated cinder.conf')
+  ssh_known_hosts: |
+    # Empty SSH host file managed by cinder-volume-netapp