fix(systems) Declare services as subtabs of servicesManagement

This will allow to find ACL for services attributes through
 userinfo::getAttributeCategory

issue #5949

systems/admin/systems/class_serverService.inc

@@ -63,6 +63,7 @@ class ServerService extends simpleManagement
       'plSelfModify'  => FALSE,
       'plObjectType'  => array('server'),
       'plPrority'     => 5,
+      'plSubTabs'     => 'SERVERSERVICE',
 
       'plProvidedAcls'  => array()
     );

[Ghost User]

SonarQube analysis reported 2 issues

• 2 major

Note: The following issues were found on lines that were not modified in the commit. Because these issues can't be reported as line comments, they are summarized here:

1. This function "getUserValues" has 211 lines, which is greater than the 150 lines authorized. Split it into smaller functions.
2. Remove this unused "$class" local variable.