Mirror UMD5 repositories

Following the release of UMD5

https://repository.egi.eu/umd/distribution.html?id=5&194

Installation instructions:

https://repository.egi.eu/umd/installation-notes.html?id=5

GPG key is:

https://repository.egi.eu/sw/production/umd/UMD-5-RPM-PGP-KEY

/cc @lfield