Release v4.0.18

Changes in v4.0.18

• shellcheck fixes and remove unused variables
• add buildOSString to go client, add tests
• fix python quote style, go lint warnings
• fix epel repo parsing: use orig_name for sed substitution
• add verbose/debug output to dry-run mode
• add -y/--dry-run to bash and python, -c short opt to go
• add -H/--hostname to go, -p/--protocol to python and go
• harden check_conf, remove rpm guard from reboot detection
• remove --post-hook, update hooks to use -n directly
• add multi-distro reboot detection to bash and python
• add cdn detection, apt updates, mirror+file:// to all clients
• add --post-hook and file locking to python and go
• remove dead -r/--report code from python
• add conf.d, --no-repo-check, expanded config parsing to python and go
• port client updates from main repo to bash
• fix yum data correctness: priority parsing, arch dedup, cpe prefix
• fix metalink/mirrors url capture across clients