use new sdbus++ camelcase

Change I17a8d7479556596a3cf252b3f4eae9c8df547189 will change
how sdbus++ generates names which start with an acronym.
Prepare for this by keying off the SDBUSPP_NEW_CAMELCASE
define to use the new format.

Changes:
    dHCPEnabled -> dhcpEnabled
    dNSEnabled -> dnsEnabled
    iP -> ip
    iPAddress -> ipAddress
    iPv6AcceptRA -> ipv6AcceptRA
    mACAddress -> macAddress
    nICEnabled -> nicEnabled
    nTPEnabled -> ntpEnabled
    nTPServers -> ntpServers

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I35da2c4f8fc33262d6d096e499220419ebe4d00d
diff --git a/vlan_interface.hpp b/vlan_interface.hpp
index a6674ea..c003056 100644
--- a/vlan_interface.hpp
+++ b/vlan_interface.hpp
@@ -58,7 +58,7 @@
      *  @param[in] value - MAC address which needs to be set on the system.
      *  @returns macAddress of the interface or throws an error.
      */
-    std::string mACAddress(std::string value) override;
+    std::string macAddress(std::string value) override;
 
     /** @brief writes the device configuration.
                systemd reads this configuration file