Remove unused arguments for stack-preview command
Remove unused arguments for stack-preview command

--create-timeout/--timeout and --disable-rollback have no meaning in the
context of stack-preview, and actually are not used by Heat during
stack preview action, so remove them.

Change-Id: I1f991eaddf98b0e5c0c3f8b4aaa33947eba53664
Closes-Bug: #1297748

rdo-management/python-heatclient,tcpcloud/python-heatclient,varunarya10/python-heatclient,ecerulm/python-heatclient,tcpcloud/python-heatclient,openstack/python-heatclient,varunarya10/python-heatclient,ecerulm/python-heatclient,rdo-management/python-heatclient