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/core/perf/perf_umat.cpp

@@ -5,13 +5,10 @@
 #include "perf_precomp.hpp"
 #include "opencv2/ts/ocl_perf.hpp"
 
-using namespace std;
-using namespace cv;
-using namespace ::perf;
+namespace opencv_test
+{
+using namespace perf;
 using namespace ::cvtest::ocl;
-using namespace ::testing;
-using std::tr1::tuple;
-using std::tr1::get;
 
 
 struct OpenCLState
@@ -63,3 +60,5 @@ OCL_PERF_TEST_P(UMatTest, CustomPtr, Combine(Values(sz1080p, sz2160p), Bool(), :
 
     SANITY_CHECK_NOTHING();
 }
+
+} // namespace