RDKB-34434 : Fix for error while saving DHCP range
RDKB-34434 : Fix for error while saving DHCP range

Reason for change: Adding additional checks while saving valid dhcp range.
Test Procedure: Verify the valid dhcp range.
Risks: None

Signed-off-by: c6a2df48e7e61e58f2efa28fde6cc100dbea4fb2@comcast.com
Change-Id: Icda9b97764d157243eaa2b68dc452d571424931c

rdkcmf/rdkb-CcspPandM,rdkcmf/rdkb-CcspPandM,rdkcmf/rdkb-CcspPandM