Host / FQDN support for IOS-XE connector

[netgab]

The IOS-XE connector always connects to an IP address (connection.ip):

rest/src/rest/connector/libs/iosxe/implementation.py

Lines 117 to 125 in aea6406

	ip = self.connection_info.ip.exploded
	port = self.connection_info.get('port', port)
	if 'protocol' in self.connection_info:
	protocol = self.connection_info['protocol']
	self.base_url = '{protocol}://{ip}:{port}'.format(protocol=protocol,
	ip=ip,
	port=port)

As TLS certificate do not contain IP addresses (IP SAN) in most cases, certificate validation is not possible for these devices.

Proposed change: If there is a host key in the connection, prefer the host value (FQDN).
If not present, fallback to ip.

This behavior is already implemented in the DNAC connector:

rest/src/rest/connector/libs/dnac/implementation.py

Lines 78 to 82 in aea6406

	try:
	host = self.connection_info['host']
	except KeyError:
	host = self.connection_info['ip'].exploded