Replace asserts in __init__ files with __all__

Defines __all__ in place of assert statements in the __init__.py files.

Change-Id: I0e871789d012e3ec579a8563a61d7ae32e20ed96
Closes-bug: #1251546
Wrong marker sent to keystone

Removed nonsense marker that prevents charts grouped by project
working. Dropping also pagination for now, there is a UX design
in progress that would present how pagination should work.

Fixes bug 1260528

Change-Id: I3c2c2b2d0c3fcc6947f53a10441f9cd1440ef0fa
Merge "Replace asserts in __init__ files with __all__"
Merge "Wrong marker sent to keystone"