explicitly mention imported functions for better readability

CI/handle_new_mr.py

 import argparse, gitlab, logging, re, sys
 from gitlab.exceptions import GitlabGetError
-from gitlab_mr_helpers import *
+from gitlab_mr_helpers import print_collection, list_changed_packages, list_affected_domains
 from WatchList import WATCH_LIST
 
 def comment_affected_packages(packages):

CI/run_unit_tests_for_mr.py

 import argparse, gitlab, logging, sys
 from gitlab.exceptions import GitlabGetError
-from gitlab_mr_helpers import *
+from gitlab_mr_helpers import print_collection, map_filename_to_package
 
 def run_unit_tests(args):
     # get GitLab API handler