Set default python

Python needs to be set to python2 before checking for python3 to prevent
certain test framework errors.

Change-Id: Ifd1ed35160338688d3c723c055ca75cd999e46e0

elasticsearch/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v7.6.2
 description: OpenStack-Helm ElasticSearch
 name: elasticsearch
-version: 0.2.19
+version: 0.2.20
 home: https://www.elastic.co/
 sources:
   - https://github.com/elastic/elasticsearch

elasticsearch/templates/bin/_helm-tests.sh.tpl

@@ -15,8 +15,9 @@ limitations under the License.
 
 set -ex
 
+python='python'
 if [[ $(which python3) ]]; then
-    alias python=python3
+    python='python3'
 fi
 
 function create_test_index () {
@@ -30,7 +31,7 @@ function create_test_index () {
       }
     }
   }
-  ' | python -c "import sys, json; print(json.load(sys.stdin)['acknowledged'])")
+  ' | $python -c "import sys, json; print(json.load(sys.stdin)['acknowledged'])")
   if [ "$index_result" == "True" ];
   then
     echo "PASS: Test index created!";

releasenotes/notes/elasticsearch.yaml

@@ -29,4 +29,5 @@ elasticsearch:
   - 0.2.17 Annotate ES master/data sts with S3 secret hash
   - 0.2.18 Update default image value to Wallaby
   - 0.2.19 Migrated CronJob resource to batch/v1 API version
+  - 0.2.20 Set default python for helm test
 ...