Fix senlin cluster policy list error
Fix senlin cluster policy list error

This patch fix cluster policy list error when don't use -F arguments

Closes-Bug: 1704930

Change-Id: Idb2d1b9b27f8ea2f719712a5cba8f606a4691248
Signed-off-by: Yuanbin.Chen <115798e15ddd872778e240322a1a46f7d51b5ce2@gmail.com>

openstack/python-senlinclient,stackforge/python-senlinclient,stackforge/python-senlinclient,openstack/python-senlinclient