tools/tests: small end-to-end test suite for importing/pruning

As bigger changes lie ahead, we want a small end-to-end test suite
that ensures that our importing and tracing does not fall apart. With
this change, we add the infrastructure and two test-cases (fib, qsort)
including ELFs, traces, and injection results.

In order to run the basic-pruner test cases, one needs to setup a
MySQL table and set the CMake option ENABLE_DATABASE_TESTS.

tools/tests/fib/state/virt_timer

@@ -0,0 +1,34 @@
+virt_timer = {
+  timer = {
+    0 = {
+      inUse = true
+      period = 2147483647
+      timeToFire = 2147483647
+      active = true
+      continuous = true
+    }
+    1 = {
+      inUse = true
+      period = 3599
+      timeToFire = 15896924
+      active = true
+      continuous = false
+    }
+  }
+  current_timers_time = 15893325
+  timers_next_event_time = 3599
+  last_sequential_time = 0
+  virtual_next_event_time = 3599
+  current_virtual_time = 15893325
+  last_real_time = 1578924690899518
+  total_real_usec = 0
+  last_realtime_delta = 0
+  last_usec = 0
+  usec_per_second = 1000000
+  stored_delta = 0
+  last_system_usec = 0
+  em_last_realtime = 0
+  total_ticks = 0
+  last_realtime_ticks = 0
+  ticks_per_second = 1000000
+}