Description of problem:
Creating egress dns proxy container failed, the logs show the error like: /bin/egress-dns-proxy.sh: line 24: EGRESS_DNS_PROXY_DESTINATION: unbound variable

Version-Release number of selected component (if applicable):
v3.10.0-0.32.0

How reproducible:
Every time

Steps to Reproduce:
1. Create egress dns proxy test yaml file
2. oc create -f test.yaml
3. oc logs egress-dns-proxy pod

Actual results:
Creating egress dns proxy container failed with error
[root@host-172-16-120-151 ~]# oc logs egress-dns-proxy
/bin/egress-dns-proxy.sh: line 24: EGRESS_DNS_PROXY_DESTINATION: unbound variable


Expected results:
Creating egress dns proxy container without any errors

Additional info:
The test steps and logs are attched