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

test/kernel/sys_vumap/vumaprelay.c

@@ -70,7 +70,7 @@ int main(int argc, char **argv)
 
 		m.m_type = do_request(&m);
 
-		send(m.m_source, &m);
+		ipc_send(m.m_source, &m);
 	}
 
 	return 0;

test/kernel/sys_vumap/vumaptest.c

@@ -253,7 +253,7 @@ static int relay_vumap(struct vumap_vir *vvec, int vcount, size_t offset,
 	m.VTR_PGRANT = pgrant;
 	m.VTR_PCOUNT = *pcount;
 
-	r = sendrec(endpt, &m);
+	r = ipc_sendrec(endpt, &m);
 
 	cpf_revoke(pgrant);
 	cpf_revoke(vgrant);