Fix tuskar docs building

Fixed a problem with the docs not even building and cleaned up the
sphinx warnings. Changed the directory structure to more closely
resemble other OpenStack projects. This doesn't address any of the
content yet, simply the structure and ability to build.

Change-Id: I2b00b12b7664d58d44994b9d0e23a55c96379c18
Merge "Fix tuskar docs building"