Add assertion that terminate clio (#994)

Fixes #893.

Also added termination handler to print backtrace on crash, so fixes #929.

unittests/Main.cpp

@@ -16,6 +16,8 @@
     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 //==============================================================================
+
+#include <util/TerminationHandler.h>
 #include <util/prometheus/Prometheus.h>
 
 #include <gtest/gtest.h>
@@ -23,6 +25,7 @@
 int
 main(int argc, char** argv)
 {
+    util::setTerminationHandler();
     PrometheusService::init();
     testing::InitGoogleTest(&argc, argv);
     return RUN_ALL_TESTS();