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/imgproc/test/test_canny.cpp

@@ -41,8 +41,7 @@
 
 #include "test_precomp.hpp"
 
-using namespace cv;
-using namespace std;
+namespace opencv_test { namespace {
 
 class CV_CannyTest : public cvtest::ArrayTest
 {
@@ -426,4 +425,5 @@ TEST_P(CannyVX, Accuracy)
                 )
     );
 
+}} // namespace
 /* End of file. */