issue_248:Proxy added to acng.conf

[Sreejith-Krishnan]

What does this PR do?

Fixes #248 This PR will add the Proxy in 'acng.conf' file.

Do you have any concerns with this PR?

No

How can the reviewer verify this PR?

After executing the yaml file, Proxy value get added in to acng.conf file

Any background context you want to provide?

This is part of adding http_proxy support for Snaps-boot

Screenshots or logs (if appropriate)

Log Snippets : ''' INFO:ansible_utils:Applying playbook [/usr/local/lib/python2.7/dist-packages/snaps_boot/ansible_p/setup/setup_proxy_server.yaml] with variables - {'http_proxy': 'http://165.245.105.75:80'} '''

''' TASK [Configure apt-cacher-ng - Proxy Settings] *** ok: [localhost] '''

Questions:

• Have you connected this PR to the issue it resolves? yes
• Does the documentation need an update? May not be
• Does this add new Python dependencies? No
• Have you added unit or functional tests for this PR? Tested the entire script
• Does this patch update any configuration files? No