Createrepo causes module conflict on RHEL 8 reposync

Issue

• How to manually insert module metadata into existing repodata

• Repository mirror for RHEL8 created via createrepo_c command does not handle modules information correctly:

  # yum update
  ...
  Error:
  Problem 1: cannot install both perl-libs-4:5.24.4-404.module+el8.1.0+2926+ce7246ad.x86_64 and perl-libs-4:5.26.3-416.el8.x86_64
  - package perl-Algorithm-Diff-1.1903-10.module+el8.1.0+2926+ce7246ad.noarch requires perl(:MODULE_COMPAT_5.24.4), but none of the providers can be installed
  - cannot install the best update candidate for package perl-libs-4:5.26.3-416.el8.x86_64
  - cannot install the best update candidate for package perl-Algorithm-Diff-1.1903-9.el8.noarch
  

• After switching to direct update from Red Hat provided repositories, then there are no errors.