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/cudaimgproc/test/test_blend.cpp

@@ -44,7 +44,7 @@
 
 #ifdef HAVE_CUDA
 
-using namespace cvtest;
+namespace opencv_test { namespace {
 
 ////////////////////////////////////////////////////////////////////////////
 // Blend
@@ -121,4 +121,6 @@ INSTANTIATE_TEST_CASE_P(CUDA_ImgProc, Blend, testing::Combine(
     testing::Values(MatType(CV_8UC1), MatType(CV_8UC3), MatType(CV_8UC4), MatType(CV_32FC1), MatType(CV_32FC3), MatType(CV_32FC4)),
     WHOLE_SUBMAT));
 
+
+}} // namespace
 #endif // HAVE_CUDA