Agent failure with Python3

[Chuck Short]

Brief Description
-----------------

Installation failure because of python3 string regex:

2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task File "/usr/lib64/python3.6/sre_parse.py", line 855, in parse
2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, 0)
2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task File "/usr/lib64/python3.6/sre_parse.py", line 416, in _parse_sub
2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task not nested and not items))
2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task File "/usr/lib64/python3.6/sre_parse.py", line 502, in _parse
2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task code = _escape(source, this, state)
2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task File "/usr/lib64/python3.6/sre_parse.py", line 401, in _escape
2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task raise source.error("bad escape %s" % escape, len(escape))
2021-06-30 12:26:02.167 71787 ERROR sysinv.openstack.common.periodic_task sre_constants.error: bad escape \M at position 14

Severity
--------

Critical

Steps to Reproduce
------------------

Install Centos8 release of starlingx from master.

Expected Behaviour
-----------------

Bootstrap to complete.

Reproducibility
---------------

100% reproducable

System Configuration
--------------------

stx-aio

Branch
------

f/centos8

Last Pass
---------

Never

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/config/+/799471
Committed: https://opendev.org/starlingx/config/commit/bfb7eac273333b02e8ad8869cb3e0b1e7a8caf1e
Submitter: "Zuul (22348)"
Branch: f/centos8

commit bfb7eac273333b02e8ad8869cb3e0b1e7a8caf1e
Author: Charles Short <email address hidden>
Date: Mon Jul 5 08:32:24 2021 -0400

    Fix traceback while running agent

    In python2 an invalid escape error was treated as a literal, in python3
    it is treated as an error.

    Tested code snipped on both centos7(python2.7) and centos8(python3.6).

    Closes-bug: 1934671

    Signed-off-by: Charles Short <email address hidden>
    Change-Id: I81936c2e643a687d5aeef33c9531550acf647259

[Ghada Khalil (gkhalil)]

@Chuck, LPs are not updated to Fix Released automatically unless the change is merged in the stx master branch. Please update this LP manually if it's only meant for the f/centos8 branch

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/config/+/802509

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/config/+/802509
Committed: https://opendev.org/starlingx/config/commit/04d9e3ed7fcc42b4ed64cfe0ba1b3537ba4120bc
Submitter: "Zuul (22348)"
Branch: master

commit 04d9e3ed7fcc42b4ed64cfe0ba1b3537ba4120bc
Author: Charles Short <email address hidden>
Date: Mon Jul 5 08:32:24 2021 -0400

    Fix traceback while running agent

    In python2 an invalid escape error was treated as a literal, in python3
    it is treated as an error.

    Tested code snipped on both centos7(python2.7) and centos8(python3.6).

    Closes-bug: 1934671

    Signed-off-by: Charles Short <email address hidden>
    Change-Id: I81936c2e643a687d5aeef33c9531550acf647259
    (cherry picked from commit bfb7eac273333b02e8ad8869cb3e0b1e7a8caf1e)