missing releaseOverride option

[drieks]

Describe the bug
The field {{ .Release.Name }} can contain dots, but container names with dots are not allowed

See #373

To Reproduce

helm template some.name.with.dot --set haproxy.enabled=true charts/redis-ha

# Source: redis-ha/templates/tests/test-redis-ha-pod.yaml
spec:
  containers:
    - name: "some.name.with.dot-service-test"

Expected behavior
It should be possible to override the release name:

helm template some.name.with.dot --set haproxy.enabled=true --set releaseOverride=redis-ha charts/redis-ha

# Source: redis-ha/templates/tests/test-redis-ha-pod.yaml
spec:
  containers:
    - name: "redis-ha-service-test"