Remove xc/device_number_test.ml
Remove xc/device_number_test.ml

This has been fixed up and moved to xcp-idl.git to be with the code it
tests.

Signed-off-by: John Else <37b74501daa612e48fea94f9846ed4ddeb6a8f07@citrix.com>

euanh/xenopsd,johnelse/xenopsd,johnelse/xenopsd,thomassa/xenopsd,thomassa/xenopsd,euanh/xenopsd,johnelse/xenopsd,euanh/xenopsd,thomassa/xenopsd