Recently horizon test configuration was changed to use
the Django default test runner because nose is in maintenance mode
for the past several years [1]. Django testcase and oslotest are
incompatible, so congress_dashboard testcase now fails.
test_fake.py actually tests nothing, so there is no reason
to keep it. It sounds reasonable to drop this file.
[1] horizon commit 1f80d94459856a8c477310cc0fe4b0e165d8c0c1
Change-Id: I0b99e709fda9c933ec229bb1dde161cf5bea319b
c29ddbbeed