Pods gets crashing if you have deny-all network policy in place

**Describe the bug**
If your namespace has a deny-all network policy in place pods get crashing. If the chart has the option to enable networking it should set correct network policies:
- Chart has ingress settings for couch pod - pod communication but does not have egress allowed
- Readiness and liveness probe fails because kube-dns can not communicate. (because of the deny-all policy)

I think its standard practice to have deny-all traffic, maybe other users faced similar problems before.

**Version of Helm and Kubernetes**:
Helm version: v3.2.1
k8s version: 1.18

**What happened**:
Chart not setting correct network policies as described in the description above.

**What you expected to happen**:
The chart should set correct network policies. Keeping in mind cluster has deny-all policy set already.

**How to reproduce it** (as minimally and precisely as possible):
Create deny-all network policy and try to install chart. Pods get crashing all the time for readiness probe.

**Anything else we need to know**:
I have a fix :P
It should include these policies based on some flag maybe

```
apiVersion: extensions/v1beta1
kind: NetworkPolicy
metadata:
name: allow-egress-to-kube-dns
spec:
egress:
- ports:
- port: 53
protocol: UDP
to:
- namespaceSelector:
matchLabels:
kube-system: "true"
podSelector:
matchLabels:
app: couchdb
release: aptrack-db
policyTypes:
- Egress
---
apiVersion: extensions/v1beta1
kind: NetworkPolicy
metadata:
name: allow-pod-to-pod
namespace: aptrack-db-int
spec:
egress:
- ports:
- port: 5984
protocol: TCP
- ports:
- port: 9100
protocol: TCP
- port: 4369
protocol: TCP
to:
- podSelector:
matchLabels:
app: couchdb
release: aptrack-db
podSelector:
matchLabels:
app: couchdb
release: aptrack-db
ingress:
- ports:
- port: 5984
protocol: TCP
- from:
- podSelector:
matchLabels:
app: couchdb
release: aptrack-db
ports:
- port: 9100
protocol: TCP
- port: 4369
protocol: TCP
podSelector:
matchLabels:
app: couchdb
release: aptrack-db
policyTypes:
- Ingress
- Egress
```