findbugs: ignore: ignore unused host variable in parse dns record

findbugs complains that host variable is never used
its true but this method parse host and port and we may
need the use of host address in the future.

findbugs reason:
DLS: Dead store to local variable (DLS_DEAD_LOCAL_STORE)

Change-Id: Iab73f4f2b502af08e8485e00a20c974d1a472433
Signed-off-by: Shahar Havivi <shavivi@redhat.com>