[NRRPLT-5939] New script to change all the nprRepos versions automatically

The script reads the repos.txt file from the user-scripts and:

1. Compares the old version with the new one in all the repos, and
   if they new is smaller it stops execution
2. Changes all the versions in all the repos to the new version

Change-Id: I9ddff07ea935adb73e595a2e8d6a404b08e69a21