ts: refactor OpenCV tests

- removed tr1 usage (dropped in C++17)
- moved includes of vector/map/iostream/limits into ts.hpp
- require opencv_test + anonymous namespace (added compile check)
- fixed norm() usage (must be from cvtest::norm for checks) and other conflict functions
- added missing license headers

modules/cudafeatures2d/perf/perf_features2d.cpp

@@ -42,9 +42,7 @@
 
 #include "perf_precomp.hpp"
 
-using namespace std;
-using namespace testing;
-using namespace perf;
+namespace opencv_test { namespace {
 
 //////////////////////////////////////////////////////////////////////
 // FAST
@@ -310,3 +308,5 @@ PERF_TEST_P(DescSize_Norm, BFRadiusMatch,
         SANITY_CHECK_MATCHES(cpu_matches);
     }
 }
+
+}} // namespace