csum: move p4_csum into csum.h

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
xio: redirect stdout, stderr to syslog in daemon mode

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
xio: minor: rename variable

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>