Add metafiles cleanup routines at S3 pack script

Added cleanup functionality for the meta files.
Script may have the following situations:

 - package files removed at S3, but it still registered:
   Script stores and registers the new packages at S3 and
   removes all the other registered blocks for the sames
   files in meta files.

 - package files already exists at S3 with the same hashes:
   Script passes it with warning message.

 - package files already exists at S3 with the old hashes:
   Script fails w/o force flag, otherwise it stores and
   registers the new packages at S3 and removes all the other
   registered blocks for the sames files in meta files.

Added '-s|skip_errors' option flag to skip errors on changed
packages to avoid of exits on script run.

Part of #4839