ssa.c: Change node_type "Combined" string to be more informative

In case of having combined node_type, convert it
to one of the following strings:
 - Core + Access (node_type 5)
 - Distribution + Access (node_type 6)

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>
core.c: Reduce allocated buffer size for dumping distribution tree

Buffer size is reduced due to elimination of distribution tree
log line containing the number of access node consumers, that
was introduced by the commit 5cfa98563596c6368fb3f4feb70f6cade262502d

core.c: Added better handling of children to core_dump_tree/ssa_sprint_member

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>