pfSense

Fix #7469

• Rename local_sync_accounts() to local_reset_accounts() and keep it
  only being used /etc/rc.bootup
• Reimplement local_sync_accounts() receiving a list of users and
  groups to be added and/or deleted
• Remove call to filter_configure xmlrpc method from
  rc.filter_synchronize since it's now called internally from
  restore_config_section.
• On restore_config_section implementation stop copying all content
  from user/group sections. Instead check for new/modified/deleted
  items and create necessary arrays to be passed to local_syng_accounts
• Add a parameter to filter_configure xmlrpc method to decide when to
  call a full reset of users/groups using local_reset_accounts()