[Pulp-list] Migration failure, 2.16 -> 2.18

[Kodiak Firesmith]

Hi Folks,
I have a beta and a prod pulp server, beta is much smaller but otherwise I
keep them identical.  Last week I updated the beta host from 2.16 to latest
without any issues.  Today I attempted to upgrade prod in the same way and
ended up with a fatal migration error :(

Any chance a Pulp dev can parse this traceback?  The final error that bombs
the migration is 'IOError: Not a gzipped file', on migration unit
'pulp_rpm.plugins.migrations.0043_add_modulemd_modulemd-defaults'.

https://paste.fedoraproject.org/paste/wEIu5a3Tf8OejEzMNsXN9w


Packages installed are:
$rpm -qa | egrep 'pulp|qpid|gofer|celery|mongo' | sort
mongodb-2.6.12-6.el7.x86_64
mongodb-server-2.6.12-6.el7.x86_64
pulp-admin-client-2.18.1-2.el7.noarch
pulp-docker-admin-extensions-3.2.2-1.el7.noarch
pulp-docker-plugins-3.2.2-1.el7.noarch
pulp-puppet-admin-extensions-2.18.1-1.el7.noarch
pulp-puppet-plugins-2.18.1-1.el7.noarch
pulp-rpm-admin-extensions-2.18.1-1.el7.noarch
pulp-rpm-plugins-2.18.1-1.el7.noarch
pulp-selinux-2.18.1-2.el7.noarch
pulp-server-2.18.1-2.el7.noarch
python2-celery-4.0.2-7.el7.noarch
python2-qpid-1.37.0-4.el7.noarch
python2-qpid-qmf-1.39.0-1.el7.x86_64
python-gofer-2.12.5-1.el7.noarch
python-gofer-qpid-2.12.5-1.el7.noarch
python-isodate-0.5.0-4.pulp.el7.noarch
python-mongoengine-0.10.5-1.el7.noarch
python-pulp-bindings-2.18.1-2.el7.noarch
python-pulp-client-lib-2.18.1-2.el7.noarch
python-pulp-common-2.18.1-2.el7.noarch
python-pulp-docker-common-3.2.2-1.el7.noarch
python-pulp-oid_validation-2.18.1-2.el7.noarch
python-pulp-puppet-common-2.18.1-1.el7.noarch
python-pulp-repoauth-2.18.1-2.el7.noarch
python-pulp-rpm-common-2.18.1-1.el7.noarch
python-pymongo-3.2-2.el7.x86_64
python-pymongo-gridfs-3.2-2.el7.x86_64
qpid-cpp-client-1.39.0-1.el7.x86_64
qpid-cpp-server-1.39.0-1.el7.x86_64
qpid-cpp-server-linearstore-1.39.0-1.el7.x86_64
qpid-proton-c-0.26.0-1.el7.x86_64
qpid-qmf-1.39.0-1.el7.x86_64
qpid-tools-1.39.0-1.el7.noarch

Thanks very much for any input you can give on this issue!
 - Kodiak Firesmith
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