TCCBR-4621 : LMLite crash.
TCCBR-4621 : LMLite crash.

Reason for change:
Host has been added from dibber server-cache and.
deleting from sync thread repeatedly.
Hence lmlite dml layer accessed invalid pointer.
So avoided host adding from dibbler and only updated
ipv6 for the host from dibbler server-cache.xml.

Test Procedure:
1.Test all clients whether it gets dibbler ipv6.
2. Test and confirm all clients are there in host table.

Risks: None
Signed-off-by: 229cf53d6430217e576c0cb5c02f9ac3ab3ba648@comcast.com
(cherry picked from commit d12cfe1eeec3f14a2026d5a180b47e6955ec54c0)
(cherry picked from commit d3217c577161c693e8416a36f1004ea3f932eef4)
Change-Id: I3d1379444a8cfc03169c1e176e2369ce396a5bd7

rdkcmf/rdkb-CcspLMLite,rdkcmf/rdkb-CcspLMLite,rdkcmf/rdkb-CcspLMLite