Ensure date fields are rendered as DateColumn
Ensure date fields are rendered as DateColumn

Ensure that the settings.DATEFORMAT is applied to all
date columns in scheduler tables.

Change-Id: If8dd3a5339c81b07cac3edd503abc2555559be37
Closes: #894 https://bugs.linaro.org/show_bug.cgi?id=894

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