[bin][findtests] remove obsolete imports

bin/testing/findtests.py

@@ -6,7 +6,6 @@ Run this in the build directory
 Warning: This runs 'make clean' on the build directory
 """
 
-import multiprocessing as mp
 import json
 import subprocess
 from argparse import ArgumentParser
@@ -14,8 +13,6 @@ from glob import glob
 from subprocess import PIPE
 import os
 
-import sys
-
 # Whether the two lists a and b have a common member
 def has_common_member(myset, mylist):
     return not myset.isdisjoint(mylist)