test/self: add /proc/self/ open+read test case

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/.gitignore b/.gitignore
index cd5fd58..53c076f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -86,6 +86,7 @@
 /test/register-restrictions
 /test/rename
 /test/ring-leak
+/test/self
 /test/send_recv
 /test/send_recvmsg
 /test/shared-wq