Do not log getent services command execution

Because its output is too long, now the `logger: nil` option is passed to
Yast::Execute in order to use the Cheetah::NullRecorder[1].

[1] https://github.com/openSUSE/cheetah/blob/bafcf46680fba6cc3fa3e60498d2f1d2b741d6e3/lib/cheetah.rb#L129

library/network/src/modules/PortAliases.rb

@@ -155,7 +155,8 @@ def services
     #
     # @return [Array<String>] list of available services
     def services_database
-      Yast::Execute.stdout.on_target!("/usr/bin/getent", "services").lines
+      # Log nothing from this command because its long output (logger: nil)
+      Yast::Execute.stdout.on_target!("/usr/bin/getent", "services", logger: nil).lines
     end
 
     # Convenience method to easily find a loaded service by alias