Fix bug with Puppet restarting Nexus on each run

[sergsyelp]

Puppet toggles user and group on the configuration file back and forth
and restarts Nexus service. Set correct owner and group on the config file so this
does not happen.

Info: Applying configuration version '1651858924'
Notice: /Stage[main]/Nexus::Package/File[/nail/srv/nexus-2.14.9-01/conf/nexus.properties]/owner: owner changed 'root' to 'nexus'
Notice: /Stage[main]/Nexus::Package/File[/nail/srv/nexus-2.14.9-01/conf/nexus.properties]/group: group changed 'root' to 'nexus'
Info: Class[Nexus::Package]: Scheduling refresh of Class[Nexus::Service]
Notice: /Stage[main]/Nexus::Config/File[/nail/srv/nexus/conf/nexus.properties]/owner: owner changed 'nexus' to 'root'
Notice: /Stage[main]/Nexus::Config/File[/nail/srv/nexus/conf/nexus.properties]/group: group changed 'nexus' to 'root'
Info: Class[Nexus::Config]: Scheduling refresh of Class[Nexus::Service]
Info: Class[Nexus::Service]: Scheduling refresh of Service[nexus]