extend hammer to prepare kea to test it with TSAN

While checking what is really needed to run fully automated system tests against KEA with TSAN enabled I came to a conclusion that different compilation procedure have to be incorporated in hammer.

In TSAN job in jenkins we are using:

CXX=clang++
CXXFLAGS="-g3 -ggdb -O0 -fsanitize=thread -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches"
TSAN_OPTIONS="detect_deadlocks=1 second_deadlock_stack=1"