[stable/cockroachdb]: Add more OWNERS to cockroachdb chart

These three all have good knowledge of CockroachDB and experience
running it in production on Kubernetes.

Signed-off-by: Alex Robinson <alexdwanerobinson@gmail.com>

stable/cockroachdb/Chart.yaml

@@ -1,12 +1,18 @@
 apiVersion: v1
 name: cockroachdb
 home: https://www.cockroachlabs.com
-version: 2.1.6
+version: 2.1.7
 appVersion: 19.1.0
 description: CockroachDB is a scalable, survivable, strongly-consistent SQL database.
 icon: https://raw.githubusercontent.com/cockroachdb/cockroach/master/docs/media/cockroach_db.png
 sources:
 - https://github.com/cockroachdb/cockroach
 maintainers:
 - name: a-robinson
-  email: alex@cockroachlabs.com
+  email: alexdwanerobinson@gmail.com
+- name: DuskEagle
+  email: Joel.A.Kenny@gmail.com
+- name: joshimhoff
+  email: joshimhoff13@gmail.com
+- name: keith-mcclellan
+  email: keith.mcclellan@gmail.com

stable/cockroachdb/OWNERS

@@ -1,4 +1,10 @@
 approvers:
 - a-robinson
+- DuskEagle
+- joshimhoff
+- keith-mcclellan
 reviewers:
 - a-robinson
+- DuskEagle
+- joshimhoff
+- keith-mcclellan