Remove trailing blank lines in vs/vsr snippets

[Dean-Coakley]

Proposed changes

Fixes: #1074

Remove trailing blank lines in vs/vsr snippets. Applies to all snippets(http,server,location)

Example VirtualServer input

apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
  name: cafe
  namespace: default
spec:
  http-snippets: |
    limit_req_zone $binary_remote_addr zone=mylimit:10m rate=1r/s;
    proxy_cache_path /tmp keys_zone=one:10m;
  host: cafe.example.com
  tls:
    secret: cafe-secret
  upstreams:
  - name: tea
    service: tea-svc
    port: 80
  routes:
  - path: /tea
    action:
      pass: tea

Generated config before change

limit_req_zone $binary_remote_addr zone=mylimit:10m rate=1r/s;

proxy_cache_path /tmp keys_zone=one:10m;

Generated config after change

limit_req_zone $binary_remote_addr zone=mylimit:10m rate=1r/s;
proxy_cache_path /tmp keys_zone=one:10m;

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto master
• I will ensure my PR is targeting the master branch and pulling from my branch from my own fork