[Bug 1699426] Re: Merge 4.5.1-2 from Debian Sid

[Corey Bryant]

Apologies for the lack of changelog explanation. I agree it's not useful
and sheds zero light on why this was done.

This all came about for OpenStack. The following evaluation was done by
the upstream OpenStack community to narrow down on a single mysql
client:

https://wiki.openstack.org/wiki/PyMySQL_evaluation

At the time of that evaluation mysqldb didn't have py3 support and
pymysql did. pymysql was pure-python and supported eventlet. So pymysql
was deemed the "winning" mysql client that upstream would use.

Historically Ubuntu only supports one client in main. The reason for
that is to minimize the number of packages that get LTS/security support
provided by Canonical. So with those points in mind, we updated several
packages to move from mysqldb to pymysql. We updated all packages that
were in main that used python-mysqldb to instead use python-pymysql. The
idea was that we would no longer have packages in main that depend on
mysqldb, so mysqldb could be moved out of main and into universe.

However, today I'm not sure this is all still needed or not! python-
mysqldb and python-pymysql are still both in main and upstream OpenStack
still uses both.

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https://bugs.launchpad.net/bugs/1699426

Title:
  Merge 4.5.1-2 from Debian Sid

Status in python-tornado package in Ubuntu:
  In Progress

Bug description:
  Attached is a debdiff merging python-tornado 4.5.1-2 from Debian Sid.
  The maintainer has updated the copyright, and this debdiff also
  decreases some of the erroneous delta that the most recent Ubuntu
  upload had in respect to patches.

  The debdiff is applicable to 4.5.1-2 from Sid.

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