DCS floating IP should set internal interface

[Matt Brown]

DCS currently has the following properties for floating IP:

    /** DcsMaster Floating IP external IP address */
    public static final String DCS_MASTER_FLOATING_IP_EXTERNAL_IP_ADDRESS = "dcs.master.floating.ip.external.ip.address";

    /** Default DcsMaster Floating IP external IP address */
    public static final String DEFAULT_DCS_MASTER_FLOATING_IP_EXTERNAL_IP_ADDRESS = "default";

Need to add more properties for internal interface e.g.,

    /** DcsMaster Floating IP internal IP address */
    public static final String DCS_MASTER_FLOATING_IP_INTERNAL_IP_ADDRESS = "dcs.master.floating.ip.internal.ip.address";

    /** Default DcsMaster Floating IP internal IP address */
    public static final String DEFAULT_DCS_MASTER_FLOATING_IP_INTERNAL_IP_ADDRESS = "default";

DcsMaster can then invoke dcsbind.sh for both