Rename various functions per the quidelines of https://cwiki.apache.org/confluence/display/NUTTX/Naming+of+OS+Internal+Functions nxsem_setprotocol -> nxsem_set_protocol nxsem_getprotocol -> nxsem_get_protocol nxsem_getvalue -> nxsem_get_value
Rename udp_psock_sendto_xxx.c to udp_sendto_xxx.c like TCP and remove udp_psock_send.c