refactoring: Breakdown fission-all chart into components and removed fission-core (#2224)

* Sync a few files from fission-all to fission-core chart
* Change values in fission-all chart
We keep the following components by default disabled now, which were enabled by default earlier.

1. nats - Fission Nats integration
2. influxdb - Influxdb and logger component
3. prometheus - Prometheus disabled by default
4. canaryDeployment - Disabled by default

This change reduces the need for a fission-core chart and we can configure
values of fission-all so that it can provide the behaviour of fission-all
as well as fission-core.

* Remove fission-core chart
* Add README in the fission-all chart
* Rename clusterrolebinding fission-crd to fission-cr-admin
* Add icon and sources in helm chart

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

charts/fission-all/templates/pre-upgrade-checks/pre-upgrade-job.yaml

@@ -0,0 +1,37 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: {{ template "fullname" . }}-{{ .Chart.Version }}-{{ randNumeric 3 }}
+  labels:
+    # The "release" convention makes it easy to tie a release to all of the
+    # Kubernetes resources that were created as part of that release.
+    release: "{{ .Release.Name }}"
+    # This makes it easy to audit chart usage.
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    app: {{ template "name" . }}
+  annotations:
+    # This is what defines this resource as a hook. Without this line, the
+    # job is considered part of the release.
+    "helm.sh/hook": pre-upgrade
+    "helm.sh/hook-delete-policy": hook-succeeded
+spec:
+  backoffLimit: 0
+  template:
+    metadata:
+      name: {{ template "fullname" . }}
+      labels:
+        release: "{{ .Release.Name }}"
+        app: {{ template "name" . }}
+    spec:
+      restartPolicy: Never
+      containers:
+      - name: pre-upgrade-job
+      {{- if .Values.imageTag }}
+        image: {{ .Values.preUpgradeChecksImage }}:{{ .Values.imageTag }}
+      {{- else }}
+        image: {{ .Values.preUpgradeChecksImage }}
+      {{- end }}
+        imagePullPolicy: {{ .Values.pullPolicy }}
+        command: [ "/pre-upgrade-checks" ]
+        args: ["--fn-pod-namespace", "{{ .Values.functionNamespace }}", "--envbuilder-namespace", "{{ .Values.builderNamespace }}"]
+      serviceAccountName: fission-svc