core.c: In core_process_join, add node type to an existing log message

to help with debug when join fails

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
core.c: In core_process_join, start handling for node type changes

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
core.c: In core_process_join, when in member_map may also be in orphan list

so remove from orphan list as no longer orphaned

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