Change Parsing format of IP to CIDR format and Add support for secondary IP addresses

[michael-edobor]

Parse all secondary IP addresses found under interface configs into a list and change IP address notation to cidr instead of ip address mask subnet. This can be implemented by introducing a macro to the interfaces group and using the inbuilt to_cidr method to convert the masks.

Use-case:

1. Makes it easier to create a IPNetwork object from the netaddr library
2. Easier to represent when comparing IPs with a SoT (e.g Netbox)
3. Fully account for IP information in the configs

def parse_ip(data):
	if data.get('primary_ip') and data.get('primary_mask'):
		data['primary_ip'] = data['primary_ip'] + '/' + str(data['primary_mask'])
		data.pop('primary_mask')
	if data.get('secondary_ips') and data.get('secondary_masks'):
		data['secondary_ips'] = [f"{ip}/{mask}" for ip, mask in zip(data['secondary_ips'], data['secondary_masks'])]
		data.pop('secondary_masks')
</macro>

I can submit a PR for this also.