Merge pull request 'if master check added' (!2) from tpiccioli/ansible-role-postgresql:master into master

Reviewed-on: #2

templates/postgresql_wal_backup_and_removal.j2

@@ -1,5 +1,12 @@
 #!/bin/bash
 
+ISMASTER=`psql -t -c "SELECT pg_is_in_recovery();"`
+if [ $ISMASTER != 'f' ]
+then
+   echo "Not on master, nothing to do."
+   exit 0
+fi
+
 BASE_BACKUP_DIR={{ psql_base_backup_dir }}
 WAL_ARCHIVES_LOG_DIR={{ psql_wal_archiving_log_dir }}
 WAL_LATEST_BACKUP=