Prevent removal of all columns on tasks and recipe tables

All of the columns for the tasks and recipes tables (sub-pages of the build-dashboard) are optional. This means you can remove all the columns for those tables and make them disappear from the page.

Set the non-hideable columns and add some UI tests to check that those columns are disabled in the edit columns drop-down.

The following changes since commit 0bf1a5a6c8d731a0f4f75091621dc999ee6d5ce1:

toaster: fix download URL for task logs (2016-07-20 17:05:57 +0300)

are available in the git repository at:

git://git.yoctoproject.org/poky-contrib ed/submit/elliot/toaster/9833-remove_columns
http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=ed/submit/elliot/toaster/9833-remove_columns

Elliot Smith (3):
toaster: set non-hideable columns for build tasks table
toaster: set non-hideable columns for built recipes table
toaster-tests: add tasks and recipes sub-page tests

 .../browser/test_builddashboard_page_recipes.py    | 66 ++++++++++++++++++++++
 .../browser/test_builddashboard_page_tasks.py      | 65 +++++++++++++++++++++
 bitbake/lib/toaster/toastergui/buildtables.py      |  7 ++-
 3 files changed, 137 insertions(+), 1 deletion(-)
 create mode 100644 bitbake/lib/toaster/tests/browser/test_builddashboard_page_recipes.py
 create mode 100644 bitbake/lib/toaster/tests/browser/test_builddashboard_page_tasks.py

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Regards,
Ed