DELIA-24551 : Corrected moca_ip validity check for clients in IPV6 mode
DELIA-24551 : Corrected moca_ip validity check for clients in IPV6 mode

Reason for change: moca_ip was empty in Clients in V6 mode
Test Procedure: Verify /tmp/.deviceDetails.cache
Risks: Low
Signed-off-by: gtheres <Geethu_TheresK2@comcast.com>

Change-Id: I6fa7ff2ae405ad394058465ff98d7101c0fb5fa4

rdkcmf/rdk-sysint