[Bug 1790598] Re: metadata service calls to nova-api-metadata with IP based SAN's fails

[Corey Bryant]

Regression testing was successful against xenial-proposed:

======
Totals
======
Ran: 92 tests in 1034.1765 sec.
 - Passed: 84
 - Skipped: 8
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 0
Sum of execute time for each test: 465.6833 sec.

Regression testing was successful against queens-proposed:

======
Totals
======
Ran: 92 tests in 1106.9986 sec.
 - Passed: 84
 - Skipped: 8
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 0
Sum of execute time for each test: 548.8946 sec.

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https://bugs.launchpad.net/bugs/1790598

Title:
  metadata service calls to nova-api-metadata with IP based SAN's fails

Status in neutron:
  Fix Committed
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Xenial:
  Triaged
Status in neutron source package in Bionic:
  Fix Committed
Status in neutron source package in Cosmic:
  Fix Released

Bug description:
  [Impact]
  If the nova-api-metadata service is secured with a certificate that makes use of IP based SAN's, under Python 2 certificate validation will fail as the ssl module does not support use of IP addresses in cert SAN fields (and httplib2 which is used to make the request uses ssl directly).

  Master branch of neutron has switched (see [0]) to using requests to
  make these calls, supporting use of certs with IP address based SAN's
  (via urllib3 which does support IP address based SAN's under Python
  2).

  [0]
  https://github.com/openstack/neutron/commit/7e0dd2f18d4919964655cfce7a282d1c5c131fc4

  [Test Case]
  Deploy OpenStack, securing metadata service using certs with IPAddress based SAN's (openstack charms + vault can do this).
  Boot instance - instance will fail to get metadata due to neutron->nova cert verification failure.

  [Regression Potential]
  Patch switches communication between neutron and nova for metadata queries to use requests over httplib2; so its a fairly like-for-like switch - both are used across openstack for various purposes.

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