Block on instance delete until delete operation completes
Block on instance delete until delete operation completes

Fixes issue #160

During deletion of a stack, following would occur:
delete stack
delete instance
delete eip or security group

When the last operation occurred, the instance is still present in OpenStack
making a deletion of EIP or security groups not work properly.  Serialize
the operations in resources.

Change-Id: I6e1613f5a6f5db485dd8a5f381d7a96afb58188b
Signed-off-by: Steven Dake <8638f3fce5db0278cfbc239bd581dfc00c29ec9d@redhat.com>

maestro-hybrid-cloud/heat,cwolferh/heat-scratch,citrix-openstack-build/heat,JioCloud/heat,cryptickp/heat,srznew/heat,steveb/heat,pratikmallya/heat,pratikmallya/heat,noironetworks/heat,miguelgrinberg/heat,noironetworks/heat,redhat-openstack/heat,NeCTAR-RC/heat,dims/heat,dragorosson/heat,redhat-openstack/heat,rh-s/heat,dragorosson/heat,rh-s/heat,rdo-management/heat,ntt-sic/heat,jasondunsmore/heat,rickerc/heat_audit,jasondunsmore/heat,openstack/heat,miguelgrinberg/heat,cwolferh/heat-scratch,Triv90/Heat,rdo-management/heat,rickerc/heat_audit,varunarya10/heat,openstack/heat,citrix-openstack-build/heat,cryptickp/heat,takeshineshiro/heat,takeshineshiro/heat,pshchelo/heat,dims/heat,NeCTAR-RC/heat,maestro-hybrid-cloud/heat,steveb/heat,varunarya10/heat,Triv90/Heat,gonzolino/heat,Triv90/Heat,ntt-sic/heat,JioCloud/heat,srznew/heat,gonzolino/heat,pshchelo/heat