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/qsort/.gdb_history

@@ -0,0 +1,22 @@
+b os_main 
+b start_trace 
+q
+b os_main
+b start_trace
+c
+c
+c
+s
+q
+c
+list
+symbol-file system.elf 
+list
+q
+q
+c
+bt
+x 0x00100048
+b partition 
+c
+q