remove default=None for config options

In the cfg module default=None is set as the default value.

Change-Id: I9303e2ae4b8f301757744efc09136868db29472a
Closes-bug: #1323975
1 file changed
tree: 1ddeb65c2e9bfd22fe6f81648d5c1e3cc04c2f0b
  1. manila_tempest_tests/