Add existing public redis pod/service

Add existing public redis pod/service

- Use a community yaml for redis in k8s as simple data store
- Redis can be used for tracing and also by the snort-ids
to store alerts that can be processed by other services
- If flannel is used, the redis CLI can be accessed on the
host OS with redis-cli -h <flannel ip>
- Within the k8s cluster, the redis service can be accessed with
DNS using name 'redis'
- The same yaml for redis is also included in toplevel manifest for SDC
scenario. Included here if intention is to use separately (tracing
only)

Change-Id: Ibad283a4cc8938fe01f5de6b7743bdb5511be3af
Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>