aws: support for allocating and assigning an EIP
aws: support for allocating and assigning an EIP

New cloud properties:

  cloud.eip=allocate # an EIP is automatically allocated and attached
  cloud.deploy_via_eip:bool=true # assign the EIP as the 'host' property, i.e. it will be used for deployment instead of the private ip

ohmu/poni,ohmu/poni