Prepare release 2.6.0

Author: kevin-bates

Makefile

@@ -12,7 +12,7 @@ SA?=source activate
 ENV:=enterprise-gateway-dev
 SHELL:=/bin/bash
 
-VERSION?=3.0.0.dev0
+VERSION?=2.6.0
 SPARK_VERSION?=2.4.6
 
 ifeq (dev, $(findstring dev, $(VERSION)))

enterprise_gateway/_version.py

@@ -3,4 +3,4 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-__version__ = '3.0.0.dev0'
+__version__ = '2.6.0'

etc/docker/docker-compose.yml

@@ -11,7 +11,7 @@ version: "3.5"
 services:
 
   enterprise-gateway:
-    image: elyra/enterprise-gateway:dev
+    image: elyra/enterprise-gateway:2.6.0
     user: root
     volumes:
       - "/var/run/docker.sock:/var/run/docker.sock"

etc/kubernetes/enterprise-gateway.yaml

@@ -194,7 +194,7 @@ spec:
         #  value: <configured-auth-token>
 
         # Ensure the following VERSION tag is updated to the version of Enterprise Gateway you wish to run
-        image: elyra/enterprise-gateway:dev
+        image: elyra/enterprise-gateway:2.6.0
         # Use IfNotPresent policy so that dev-based systems don't automatically
         # update. This provides more control.  Since formal tags will be release-specific
         # this policy should be sufficient for them as well.
@@ -231,7 +231,7 @@ spec:
     spec:
       containers:
       - name: kernel-image-puller 
-        image: elyra/kernel-image-puller:dev
+        image: elyra/kernel-image-puller:2.6.0
         env:
           - name: KIP_GATEWAY_HOST
             value: "http://enterprise-gateway.enterprise-gateway:8888"

etc/kubernetes/helm/enterprise-gateway/Chart.yaml

@@ -1,6 +1,6 @@
 name: enterprise-gateway
 description: A helm chart to deploy Jupyter Enterprise Gateway
-version: 3.0.0
+version: 2.6.0
 apiVersion: v1
 icon: https://avatars1.githubusercontent.com/u/7388996?s=200&v=4
 home: https://jupyter.org/enterprise_gateway

etc/kubernetes/helm/enterprise-gateway/values.yaml

@@ -1,5 +1,5 @@
 # Enterprise Gateway image name and tag to use.
-image: elyra/enterprise-gateway:dev
+image: elyra/enterprise-gateway:2.6.0
 # Enterprise Gateway image pull policy.
 imagePullPolicy: IfNotPresent
 # The primary port on which Enterprise Gateway is servicing requests.
@@ -83,7 +83,7 @@ ingress:
 kip:
   enabled: true
   # Kernel Image Puller image name and tag to use.
-  image: elyra/kernel-image-puller:dev
+  image: elyra/kernel-image-puller:2.6.0
   # Kernel Image Puller image pull policy.
   imagePullPolicy: IfNotPresent
   # Determines whether the Kernel Image Puller will pull kernel images it has previously pulled