libxl.c: switch to LOG*D use (refactored messages)

libxl.c: switch to LOG*D use (refactored messages)

Use LOG*D functions to output the domain ID in logs as much as
possible. This will help consumer code sorting the logs by
domain.

This commit, only changes LOG*() into LOG*D() and adds a domid
parameter. The message of these LOG* calls has been altered to
remove the domain id from it since it is already contained in
the output log string.

Signed-off-by: Cédric Bosdonnat <cbosdonnat@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>