Return condition to test firewalld service state

After the #11868 the condition to test the firewalld service state was
removed, causing the remediation to report error when the service is stopped.
This change also created a misalignment with Ansible remediation.
This commit returns the condition to keep the alignment and better
report the case to users.

linux_os/guide/system/network/network-firewalld/ruleset_modifications/firewalld_loopback_traffic_restricted/bash/shared.sh

@@ -12,8 +12,13 @@ ipv6_rule='rule family=ipv6 source address="::1" destination not address="::1" d
 if {{{ in_chrooted_environment }}}; then
     firewall-offline-cmd --zone=trusted --add-rich-rule="${ipv4_rule}"
     firewall-offline-cmd --zone=trusted --add-rich-rule="${ipv6_rule}"
-else
+elif systemctl is-active firewalld; then
     firewall-cmd --permanent --zone=trusted --add-rich-rule="${ipv4_rule}"
     firewall-cmd --permanent --zone=trusted --add-rich-rule="${ipv6_rule}"
     firewall-cmd --reload
+else
+    echo "
+    firewalld service is not active. Remediation aborted!
+    This remediation could not be applied because it depends on firewalld service running.
+    The service is not started by this remediation in order to prevent connection issues."
 fi

linux_os/guide/system/network/network-firewalld/ruleset_modifications/firewalld_loopback_traffic_trusted/bash/shared.sh

@@ -8,7 +8,12 @@
 
 if {{{ in_chrooted_environment }}}; then
     firewall-offline-cmd --zone=trusted --add-interface=lo
-else
+elif systemctl is-active firewalld; then
     firewall-cmd --permanent --zone=trusted --add-interface=lo
     firewall-cmd --reload
+else
+    echo "
+    firewalld service is not active. Remediation aborted!
+    This remediation could not be applied because it depends on firewalld service running.
+    The service is not started by this remediation in order to prevent connection issues."
 fi