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

lib/libbdev/ipc.c

@@ -158,7 +158,7 @@ int bdev_sendrec(dev_t dev, const message *m_orig)
   m = *m_orig;
   m.BDEV_ID = NO_ID;
 
-  r = sendrec(endpt, &m);
+  r = ipc_sendrec(endpt, &m);
 
   /* If communication failed, the driver has died. We assume it will be
    * restarted soon after, so we attempt recovery. Upon success, we let the

lib/libbdev/minor.c

@@ -46,7 +46,7 @@ int bdev_minor_reopen(dev_t dev)
 		m.BDEV_ACCESS = open_dev[i].access;
 		m.BDEV_ID = NO_ID;
 
-		if ((r = sendrec(endpt, &m)) != OK) {
+		if ((r = ipc_sendrec(endpt, &m)) != OK) {
 			printf("bdev: IPC to driver (%d) failed (%d)\n",
 				endpt, r);
 			return r;