fix(nm): Fixed dnsmasq behavior on configuration change (#5295)

Changed operations order in dhcp server configuration

Signed-off-by: pierantoniomerlino <pierantonio.merlino@eurotech.com>

kura/org.eclipse.kura.nm/src/main/java/org/eclipse/kura/nm/configuration/NMConfigurationServiceImpl.java

@@ -29,6 +29,7 @@
 import java.util.Set;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
+
 import org.eclipse.kura.KuraErrorCode;
 import org.eclipse.kura.KuraException;
 import org.eclipse.kura.configuration.ComponentConfiguration;
@@ -505,11 +506,11 @@ private void writeDhcpServerConfiguration(Set<String> interfaceNames) {
                 DhcpServerConfigWriter dhcpServerConfigWriter = buildDhcpServerConfigWriter(interfaceName,
                         this.networkProperties);
                 try {
-                    dhcpServerConfigWriter.writeConfiguration();
-                    this.dhcpServerMonitor.putDhcpServerInterfaceConfiguration(interfaceName, true);
                     this.dhcpServerMonitor.disable(interfaceName); // Side effect: we rely on the monitor bringing the
                                                                    // server back up so that the configuration change
                                                                    // takes effect
+                    dhcpServerConfigWriter.writeConfiguration();
+                    this.dhcpServerMonitor.putDhcpServerInterfaceConfiguration(interfaceName, true);
 
                 } catch (UnknownHostException | KuraException e) {
                     logger.error("Failed to write DHCP Server configuration", e);