tests: fix style (skip two lines after license boilerplate)

tests/asm_parser.rs

@@ -3,6 +3,8 @@
 // Licensed under the Apache License, Version 2.0 <http://www.apache.org/licenses/LICENSE-2.0> or
 // the MIT license <http://opensource.org/licenses/MIT>, at your option. This file may not be
 // copied, modified, or distributed except according to those terms.
+
+
 extern crate rbpf;
 extern crate combine;
 

tests/assembler.rs

@@ -3,6 +3,8 @@
 // Licensed under the Apache License, Version 2.0 <http://www.apache.org/licenses/LICENSE-2.0> or
 // the MIT license <http://opensource.org/licenses/MIT>, at your option. This file may not be
 // copied, modified, or distributed except according to those terms.
+
+
 extern crate rbpf;
 mod common;
 

tests/common.rs

@@ -6,6 +6,7 @@
 // the MIT license <http://opensource.org/licenses/MIT>, at your option. This file may not be
 // copied, modified, or distributed except according to those terms.
 
+
 // Assembly code and data for tcp_sack testcases.
 
 #[allow(dead_code)]