logrotate config file: don't change global logrotate options (#3829)

logrotate config file: don't change global logrotate options (#3829)

Global options in files in /etc/logrotate.d/ potentially influence all
other configurations parsed after the "radiusd" configuration file.
Especially the 'su radiusd radiusd' line can break things for other
packages, but also the other settings may lead to surprising behaviour,
depending on the context.

Therefore move global options into the logfile specific blocks, grouping
together equal settings to avoid a high degree of redundance.