minor, import boobs.h from uterus project

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, hygiene, wrap old bits of svc-pong.c into UD_COMPAT guard

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, provide ping message and ud_pack_ping() and ud_chck_ping()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, rewrite ud-ping in terms of svc_pong's ud_pack_ping()/ud_chck_ping()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, introduce service type ud_svc_t to unify ui16 and u8+u8 access

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'tool/ud-ping' into next

* tool/ud-ping:
  minor, introduce service type ud_svc_t to unify ui16 and u8+u8 access
  minor, rewrite ud-ping in terms of svc_pong's ud_pack_ping()/ud_chck_ping()
  minor, provide ping message and ud_pack_ping() and ud_chck_ping()
  chore, hygiene, wrap old bits of svc-pong.c into UD_COMPAT guard
  minor, import boobs.h from uterus project