Adding ipc_ prefix to ipc primitives

* Also change _orig to _intr for clarity
 * Cleaned up {IPC,KER}VEC
 * Renamed _minix_kernel_info_struct to get_minix_kerninfo
 * Merged _senda.S into _ipc.S
 * Moved into separate files get_minix_kerninfo and _do_kernel_call
 * Adapted do_kernel_call to follow same _ convention as ipc functions
 * Drop patches in libc/net/send.c and libc/include/namespace.h

Change-Id: If4ea21ecb65435170d7d87de6c826328e84c18d0

servers/is/main.c

@@ -140,7 +140,7 @@ int result;                           	/* report result to replyee */
 {
     int send_status;
     m_out.m_type = result;  		/* build reply message */
-    send_status = send(who, &m_out);    /* send the message */
+    send_status = ipc_send(who, &m_out);    /* send the message */
     if (OK != send_status)
         panic("unable to send reply!: %d", send_status);
 }