core.c: adding 'ssa_core_process_lft_change()' method

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>
core.c: In core_extract_handler, change multiple if/else clauses to switch statement

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>
core.c: Cosmetic change to some newly added routine names (ssa_core_ -> core_)

ssa_core_process_lft_change -> core_process_lft_change
ssa_core_send -> core_send

Also, eliminated a couple of blank lines

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