Merge pull request #339 from ceph/wip-9292-wusui

Cleaned up documentation.
Minor fix for vps-only locks

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Use os.path.expanduser() instead of /home

... for locating downburst executable

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Drop libmysqlclient-dev

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Draft of new README.rst
Rewrite description

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
f orig
rewrite overview
f new
new tweaks