TableTab ignores Table permissions

[Romain Hardouin]

TableTab ignores permissions set on table(s) listed in table_classes attribute.

When defining a TableTab we specify one or more DataTable via table_classes attribute:

class MyTab(tabs.TableTab):
    table_classes = [SimpleTable, ProtectedTable]

If ProtectedTable has permissions set in inner Meta classe like so:

class ProtectedTable(tables.DataTable):
    ...
    class Meta(object):
        permissions = ['openstack.roles.admin']

Permission should be honored and, in this example, only an admin must
able to view the table ProtectedTable.

How to reproduce
==============

An easy way to reproduce it is to change permission on an existing table used in a tab.
For instance, change permission of VolumeSnapshotsTable to something invalid:

class VolumeSnapshotsTable(volume_tables.VolumesTableBase):
    ...
    class Meta(object):
        ...
        permissions = ['invalid']

Then go to: Compute > Volumes > Volume Snapshots.
You will see the corresponding table.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/163643

[OpenStack Infra (hudson-openstack)]

Change abandoned by David Lyle (<email address hidden>) on branch: master
Review: https://review.openstack.org/163643
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.