introduce JMX attribute for white listed hosts. This is only enabled if security.whitelist.modification.enabled is true according to https://github.com/ImmobilienScout24/yum-repo-client/issues/6
Merge branch 'WhiteListedHosts'
improve readability
allow simple wildcard expressions for white listed hosts. A '*' matches all word characters, numbers, _ and -.
Wildcard expressions for whitelisted hosts.

Merge branch 'WhiteListedHosts'