[stable/jenkins] Remove old plugin locks before installing plugins (#1746)

* Remove old plugin locks before installing plugins

The init container will fail if the plugin .lock files exist when install_plugins is run

* Bump version to 0.8.8

stable/jenkins/templates/config.yaml

@@ -137,6 +137,7 @@ data:
     cp -n /var/jenkins_config/config.xml /var/jenkins_home;
 {{- if .Values.Master.InstallPlugins }}
     cp /var/jenkins_config/plugins.txt /var/jenkins_home;
+    rm /usr/share/jenkins/ref/plugins/*.lock
     /usr/local/bin/install-plugins.sh `echo $(cat /var/jenkins_home/plugins.txt)`;
 {{- end }}
 {{- if .Values.Master.ScriptApproval }}