Migrate to updated django-tables2 support
Migrate to updated django-tables2 support

Backport changes from current django-tables support
to retain table contents when upgrading beyond
Ubuntu 12.04 LTS.
See LAVA-785 for details and affected tables.

Change-Id: I702808bf4054f2b68b714e94824fb625e8065c41
Reviewed-on: https://staging.review.linaro.org/415
Reviewed-by: lava-bot <f1c518755f92a4c3b69132fe31fc3cc1dae5545f@linaro.org>
Reviewed-by: Antonio Terceiro <ff71b8fd519c7eab267da68c373556ac75c88179@linaro.org>

Linaro/lava-server,Linaro/lava-server,OSSystems/lava-server,OSSystems/lava-server,OSSystems/lava-server,Linaro/lava-server,Linaro/lava-server