Redfish: GET command for Hypervisor DHCP network

This commit adds support to GET the DHCP configuration
details on the Hypervisor's Ethernet Interface

Tested by:
  Set the DHCPEnabled property on /xyz/openbmc_project/network/hypervisor/eth0
  Run the redfish GET command below to check the value set.
  GET https://${bmc}/redfish/v1/Systems/hypervisor/EthernetInterfaces/eth0

  Successfully ran the Redfish Validator

Signed-off-by: Sunitha Harish <sunithaharish04@gmail.com>
Change-Id: Iacfc2b975fc6e4b759082419aa8f0b9c193d7787
diff --git a/redfish-core/lib/ethernet.hpp b/redfish-core/lib/ethernet.hpp
index b1a9f69..21443f4 100644
--- a/redfish-core/lib/ethernet.hpp
+++ b/redfish-core/lib/ethernet.hpp
@@ -65,6 +65,7 @@
     std::string netmask;
     std::string origin;
     LinkType linktype;
+    bool isActive;
 
     bool operator<(const IPv4AddressData& obj) const
     {