Dumping uevents is useful for debugging purposes.
1. Extract logic related to uevent socket into utils/UEvent.h class.
2. Use it by both UEventListener.cpp and tests/uevent_print.cpp.
Bump clang-tidy level of UEventListener.cpp to normal.
Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>