Recommended update for rmt-server

This update for rmt-server fixes the following issues:

- Preserve cached metadata timestamps. (bsc#1146611)
- Allow to mirror individual products/repositories. (bsc#1138863)
- RMT now uses mirror_src to determine whether or not to download
source packages. (bsc#1145688)
- Fix RMT installer_repo call for empty release_type parameter. (bsc#1136178)
- Clean up download queue on metadata download errors. (bsc#1142641)
- Removed release stage from names to be consistent with SCC. (bsc#1136168)

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1136178
[RMT] Register SLE12 SP3/SP4 with RMT (with SLP discovery support): No product found on RMT
bnc#1145688
RMT Source packages are not mirroring
bnc#1138863
add feature to allow RMT to mirror a single repository similar to SMT functionality
bnc#1136168
[RMT] Migration to SLE15SP1 GMC via RMT: BETA_VERSION still extists
bnc#1146611
RMT doesn't preserve timestamps of cached files
bnc#1142641
Download queue is not being cleaned up on metadata download errors
Selected Binaries
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