Allow to set quota for designate zones

In some cases default quotas are not sufficient (e.g for
tempest tests), we need to have ability to customize them.

Change-Id: Ieb688393135214ebad80c5a652a0f88c97122f97
Related-Prod: https://mirantis.jira.com/browse/PROD-15521
diff --git a/README.rst b/README.rst
index 9ca7da7..943fbea 100644
--- a/README.rst
+++ b/README.rst
@@ -77,6 +77,8 @@
                   rndc_host: 127.0.0.1
                   rndc_port: 953
                   rndc_key_file: /etc/designate/rndc.key
+        quota:
+          zones: 40
       worker:
         enabled: true
 .. note::
@@ -103,6 +105,11 @@
    In releases starting from Newton, only Designate pool manager service still allows live syncs
    with Power DNS server for now.
 
+.. note::
+   *server:quota:zones* allows to set default value for zones quota for all projects and users.
+   In case with Designate tempest plugin (0.2.0) zones quota should be increased to 40, so all
+   tests can pass.
+
 Pools pillar for BIND9 master and multiple slaves setup:
 
 .. code:: yaml