Rename 'storage' to 'control'
Rename 'storage' to 'control'

  - we will specialise this repo to include storage interfaces only
  - we will sub-divide the 'SMAPIv2' into a control and a data-plane

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@citrix.com>

xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch