Adapt tests directory to C++ namespace changes.

test/libsolidity/util/TestFileParserTests.cpp

@@ -28,13 +28,10 @@
 #include <test/libsolidity/util/TestFileParser.h>
 
 using namespace std;
-using namespace dev::test;
+using namespace solidity::util;
+using namespace solidity::test;
 
-namespace dev
-{
-namespace solidity
-{
-namespace test
+namespace solidity::frontend::test
 {
 
 using fmt = ExecutionFramework;
@@ -936,5 +933,3 @@ BOOST_AUTO_TEST_CASE(library)
 BOOST_AUTO_TEST_SUITE_END()
 
 }
-}
-}