Using oslo_config's min attribute in heat
Using oslo_config's min attribute in heat

"min=0" is now introduced in oslo_config, so no
need to check for negative integer in code for
"workers".

Change-Id: Iba2798fec4066b214026fc180a7b834122795a0b

openstack/heat,openstack/heat,noironetworks/heat,noironetworks/heat