Support post-mortem debugging on test failure

Registered by Maru Newby

Nose, our previous test runner, supported post-mortem debugging via cli arguments (--pdb and --pdb-failure). Despite there not being a good way to pass command line arguments via testr, it should be possible to enable post-mortem debugging via an environment variable.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Maru Newby
Definition:
New
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Maru Newby
Completed by
Maru Newby

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Gerrit topic: https://review.openstack.org/#q,topic:bp/neutron-pm-debug-on-test-failure,n,z

Addressed by: https://review.openstack.org/43776
    Add post-mortem debug option for tests

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