Revert "tests add to namespace sls (#464)" (#465)

This reverts commit f5745fcf18.

slsSupportLib/tests/test-network_utils.cpp

@@ -10,7 +10,7 @@
 #include "sls/sls_detector_exceptions.h"
 #include "sls/string_utils.h"
 
-namespace sls {
+using namespace sls;
 
 TEST_CASE("Convert mac address using classes", "[support]") {
 
@@ -128,5 +128,3 @@ TEST_CASE("udp dst struct basic properties") {
 }
 
 // TODO!(Erik) Look up a real hostname and verify the IP
-
-} // namespace sls