Description of problem:

[1] `openstack port create` allows creation of MAC addresses with missing digits (ex: 11:22:33:4:5:66)

[2] This is due to reliance on netaddr upstream, which presumably has these loose standards due to limited legacy cases where leading zeroes may (incorrectly) be dropped.

[3] I have submitted a pull request to clean this up, and if desired create a loose validation separately from the primary MAC validation, but I'm not sure I did a good job, and if I did, it doesn't solve the immediate problem.

[4] Here is the code in neutron-lib that appears to be calling netaddr

After creating the port, it's possible to use to build an instance, causing the instance to in some cases remain stuck in BUILD.  I will create a BZ for this issue as well.

Version-Release number of selected component (if applicable):
Current OSP16.x
Current python-netaddr

How reproducible:
Every time.

Steps to Reproduce:
1. authenticate as admin or user
2. create port, specifying a MAC address with a missing character

Actual results:
It creates the port, no complaints.

Expected results:
Port creation should fail.

Additional info:
[1]
(ess1612) [stack@undercloud-0 ~]$ openstack port create --mac-address 40:28:00:00:2:06 --network admin-tenant-overlay test-port-bad-mac_user

[2]
netaddr/strategy/eui48.py
#-----------------------------------------------------------------------------
#: Regular expressions to match all supported MAC address formats.
RE_MAC_FORMATS = ( 
    #   2 bytes x 6 (UNIX, Windows, EUI-48)
    '^' + ':'.join(['([0-9A-F]{1,2})'] * 6) + '$',
    '^' + '-'.join(['([0-9A-F]{1,2})'] * 6) + '$',

    #   4 bytes x 3 (Cisco)
    '^' + ':'.join(['([0-9A-F]{1,4})'] * 3) + '$',
    '^' + '-'.join(['([0-9A-F]{1,4})'] * 3) + '$',
    '^' + r'\.'.join(['([0-9A-F]{1,4})'] * 3) + '$',

    #   6 bytes x 2 (PostgreSQL)
    '^' + '-'.join(['([0-9A-F]{5,6})'] * 2) + '$',
    '^' + ':'.join(['([0-9A-F]{5,6})'] * 2) + '$',

    #   12 bytes (bare, no delimiters)
    '^(' + ''.join(['[0-9A-F]'] * 12) + ')$',
    '^(' + ''.join(['[0-9A-F]'] * 11) + ')$',
)

[3]https://github.com/netaddr/netaddr/pull/229

[4]
neutron_lib/api/validators/__init__.py
 366 def validate_mac_address(data, valid_values=None):
 367     """Validate data is a MAC address.
 368 
 369     :param data: The data to validate.
 370     :param valid_values: Not used!
 371     :returns: None if the data is a valid MAC address, otherwise a human
 372         readable message as to why validation failed.
 373     """
 374     try:
 375         valid_mac = netaddr.valid_mac(validate_no_whitespace(data))
 376     except Exception:
 377         valid_mac = False
 378 
 379     if valid_mac:
 380         valid_mac = (netaddr.EUI(data) not in
 381                      map(netaddr.EUI, constants.INVALID_MAC_ADDRESSES))
 382     # TODO(arosen): The code in this file should be refactored
 383     # so it catches the correct exceptions. validate_no_whitespace
 384     # raises AttributeError if data is None.
 385     if not valid_mac:
 386         msg = _("'%s' is not a valid MAC address") % data
 387         LOG.debug(msg)
 388         return msg