Adding ability to set cinder/cross_az_attach setting

Change-Id: Ica4088f725550ddb99a7414e316b5f6725d4fdf7
diff --git a/README.rst b/README.rst
index ac97a5c..da98313 100644
--- a/README.rst
+++ b/README.rst
@@ -26,6 +26,7 @@
         cpu_allocation_ratio: 8.0
         ram_allocation_ratio: 1.0
         disk_allocation_ratio: 1.0
+        cross_az_attach: false
         workers: 8
         report_interval: 60
         bind:
@@ -157,6 +158,7 @@
         version: juno
         enabled: true
         virtualization: kvm
+        cross_az_attach: false
         disk_cachemodes: network=writeback,block=none
         availability_zone: availability_zone_01
         aggregates: