dbg_assert defs added to tipc/core.h

Signed-off-by: Lokesh Mandvekar <lsm5@buffalo.edu>
extra CONFIG_TIPC_CONFIG_SERVICE added to tipc/name_table.c and CONFIG_TIPC_SYSTEM_MSGS added to tipc/discover.c

Signed-off-by: Lokesh Mandvekar <lsm5@buffalo.edu>