fabric: Remove auth_key from fi_info

Auth_key was intended to help with job authorization, but it is not
clear that such a key, which comes from the app, is useful.  Remove
it from fi_info until a use case is defined.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
fabric: Eliminate FID prefix, except when referring to struct fid

There are two prefixes used within the header files, FI and FID.
Convert most cases of FID to FI, except for the name of the fabric
interface descriptor structure, struct fid*.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
fabric: Rename openif to open_ops

Align the name to open provider specific interfaces with the rest
of the API.  Plus eliminate the 'if' from the name, which can be
misinterpretted.  An open set of operations should be simlar to
other ops, and is not a fid.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>