[stable/testlink] Remove distro tag (#8532)

Signed-off-by: Carlos Rodriguez Hernandez <crhernandez@bitnami.com>

stable/testlink/Chart.yaml

@@ -1,5 +1,5 @@
 name: testlink
-version: 3.1.0
+version: 3.1.1
 appVersion: 1.9.17
 description: Web-based test management system that facilitates software quality assurance.
 icon: https://bitnami.com/assets/stacks/testlink/img/testlink-stack-220x234.png

stable/testlink/values.yaml

@@ -10,7 +10,7 @@
 image:
   registry: docker.io
   repository: bitnami/testlink
-  tag: 1.9.17-debian-9
+  tag: 1.9.17
   ## Specify a imagePullPolicy
   ## Defaults to 'Always' if image tag is 'latest', else set to 'IfNotPresent'
   ## ref: http://kubernetes.io/docs/user-guide/images/#pre-pulling-images