T7499: update config merge tools

[jestabro]

Change summary

Before merge of the current PR, the following will need to be merged:
vyos/vyos1x-config#45
vyos/vyconf#24
vyos/libvyosconfig#42

This updates the vyos-config-merge.py script to use current tools; adds option destructive to merge; and exposes in the http-api. A unittest is added in src/tests/test_config_merge.py, analogous to test_config_diff.py.

Default non-destructive merge:

└──> ./api-merge-test.py
before: {'success': True, 'data': {'address': '10.23.2.17/24', 'hw-id': '52:54:00:20:0c:7e'}, 'error': None}
{'success': True, 'data': '', 'error': None}
after: {'success': True, 'data': {'address': '10.23.2.17/24', 'hw-id': '52:54:00:20:0c:7e'}, 'error': None}

Destructive merge:

└──> ./api-merge-test.py
before: {'success': True, 'data': {'address': '10.23.2.17/24', 'hw-id': '52:54:00:20:0c:7e'}, 'error': None}
{'success': True, 'data': '', 'error': None}
after: {'success': True, 'data': {'address': '192.168.2.137/24', 'hw-id': '52:54:00:20:0c:7e'}, 'error': None}

└──> cat api-merge-test.py 
#!/usr/bin/env python3

import json
import urllib3
from requests import request

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)


address = '192.168.122.212'
key = 'baz'
headers = {}
url_config_file = f'https://{address}/config-file'
url_retrieve = f'https://{address}/retrieve'

merge_string = 'interfaces {\nethernet eth1 {\naddress "192.168.2.137/24"\n}\n}\n'

path = ['interfaces', 'ethernet', 'eth1']

payload = {'data': json.dumps({'op': 'showConfig', 'path': path}), 'key': f'{key}'}
r = request('POST', url_retrieve, verify=False, headers=headers, data=payload)

print(f'before: {r.json()}')

payload = {'data': json.dumps({'op': 'merge', 'string': merge_string, 'destructive': True}), 'key': f'{key}'}

r = request('POST', url_config_file, verify=False, headers=headers, data=payload)

print(r.json())

payload = {'data': json.dumps({'op': 'showConfig', 'path': path}), 'key': f'{key}'}
r = request('POST', url_retrieve, verify=False, headers=headers, data=payload)

print(f'after: {r.json()}')

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

Related PR(s)

vyos/vyos1x-config#45
vyos/vyconf#24
vyos/libvyosconfig#42

How to test / Smoketest result

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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CI logs

• CLI Smoketests (no interfaces) ❌ failed
• CLI Smoketests (interfaces only) ❌ failed
• Config tests ❌ failed
• RAID1 tests ❌ failed
• TPM tests ❌ failed