Fix SDLCLI healthcheck to ignore ghost Sentinels

Fix SDLCLI healthcheck to ignore ghost Sentinels

Fix SDLCLI 'healthcheck' command to ignore Redis Sentinel entries what
have a zero port numbers, because these extra entries are not valid
entries but instead are caused by a bug (#9240) in Redis server. Until
there is a fix for the Redis server issue available, we ignore these
ghost Redis Sentinel entries from SDLCLI 'healthcheck' command's
validation.

Version: 0.9.2

Issue-Id: RIC-869

Signed-off-by: Timo Tietavainen <timo.tietavainen@nokia.com>
Change-Id: I4ba075cf66af98a59da8c558e9602ba1427fb8d9