ioreq-server: pre-series tidy up

ioreq-server: pre-series tidy up

This patch tidies up various parts of the code that following patches move
around. If these modifications were combined with the code motion it would
be easy to miss them.

There's also some function renaming to reflect purpose and a single
whitespace fix.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>