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/objdetect/test/opencl/test_hogdetector.cpp

@@ -55,7 +55,7 @@
 
 #ifdef HAVE_OPENCL
 
-namespace cvtest {
+namespace opencv_test {
 namespace ocl {
 
 ///////////////////// HOG /////////////////////////////
@@ -117,5 +117,5 @@ INSTANTIATE_TEST_CASE_P(OCL_ObjDetect, HOG, testing::Combine(
                             testing::Values(Size(64, 128), Size(48, 96)),
                             testing::Values( MatType(CV_8UC1) ) ) );
 
-}}
+}} // namespace
 #endif