Use global.pipeline for redis / kafka states

Signed-off-by: reyesj2 <94730068+reyesj2@users.noreply.github.com>

salt/global/defaults.yaml

@@ -1,2 +1,3 @@
 global:
-  pcapengine: STENO
+  pcapengine: STENO
+  pipeline: REDIS

salt/global/soc_global.yaml

@@ -37,6 +37,8 @@ global:
     advanced: True
   pipeline:
     description: Sets which pipeline technology for events to use. Currently only Redis is fully supported. Kafka is experimental and requires a Security Onion Pro license.
+    regex: ^(REDIS|KAFKA)$
+    regexFailureMessage: You must enter either REDIS or KAFKA.
     global: True
     advanced: True
   repo_host: