Add revisionHistoryLimit to deployments

[kfferrando]

We are leaving behind a replicaset every time we deploy, that never get cleaned up.

$ k get rs --all-namespaces | awk '{if ($3==0 && $4==0 && $5==0){print $1;}}' | sort | uniq -c
30 sumo-dev
30 sumo-prod
39 sumo-stage

Definining revisionHistoryLimit: <int> will ensure cleanup of stale RS.

[kfferrando]

It looks like this is being set with our version of k8s, but is probably a little high for our needs.

revisionHistoryLimit: 10