Add accept_transfer to solidfire driver

The SolidFire cluster is tenant aware and as such
needs to change account association on volume transfer.

We use the project_id to build this account, so read that
in here and create a new account if necessary and re-assign
the existing volume to the new tenant account.

Change-Id: I29879714c2d32a982918cd1305c8eb00718795fd
Merge "Add accept_transfer to solidfire driver"