If subnet is created with DHCP enabled, Port UUID generated is an incorrect UUID (not a 32 bit hexadecimal string)

[Priyanka Chopra]

Problem Statement :
While creating a network and subnet from OpenStack UI , if we enable DHCP, Port UUID generated is in incorrect UUID(not a 32 bit hexadecimal string) because of which the port creation fails.

Proposed Fix:
To resolve this the check for 32 bit hexadecimal needs to be removed.

For reference below is a snippet from OpenStack explicitly creates a device id that combines host and network ids

https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py

def get_device_id(self, network):
        """Return a unique DHCP device ID for this host on the network."""
        # There could be more than one dhcp server per network, so create
        # a device id that combines host and network ids
        return commonutils.get_dhcp_agent_device_id(network.id, self.conf.host)

http://code.metager.de/source/xref/OpenStack/quantum/neutron/common/utils.py
in utils.py

def get_dhcp_agent_device_id(network_id, host):
 # Split host so as to always use only the hostname and
 # not the domain name. This will guarantee consistentcy
 # whether a local hostname or an fqdn is passed in.
   local_hostname = host.split('.')[0]
   host_uuid = uuid.uuid5(uuid.NAMESPACE_DNS, str(local_hostname))
   return 'dhcp%s-%s' % (host_uuid, network_id)