Word error in the help info of cluster-create -m
Word error in the help info of cluster-create -m

In the help info of cluster-create -m, -1 means unlimited
not 'unlimtated'.

Change-Id: I0d3c877ad300c87ab8930e4e3de4ae4b34e0e9fa
Closes-Bug: #1498260

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