DELIA-21630: Xi DNS update is failing
DELIA-21630: Xi DNS update is failing

Reason for change: Added a fix to update DNS servers even if gateway
                   is same
Test Procedure: Modify the DNS servers at the head end side and ensure
                it is getting updated at XG1 and Xi
Risks: Low

Change-Id: I3a0124108d0b2113f4fc7b64d2b11ccef7177215
Signed-off-by: Vinu Palackal <b9c000dd474063aef1cbe744ba147aba1b229332@cable.comcast.com>

rdkcmf/rdk-sysint