HPCC-18617 Refactor Dali unit tests

Seperate different areas into different categorgies.
All used to fall under 'stress' and as such were not run by
e.g. the smoke test runs
Fix various bugs/leaks and ensure they all pass.

Signed-off-by: Jake Smith <jake.smith@lexisnexisrisk.com>

testing/unittests/unittests.cpp

@@ -176,6 +176,7 @@ int main(int argc, char* argv[])
     {
         excludeNames.append("*stress*");
         excludeNames.append("*timing*");
+        excludeNames.append("*slow*");
     }
 
     if (useDefaultLocations)