Napalm-nokia-olt

Bugfixes:

Improvements:

- get_equipment_transceiver_inventory_detail

Bugfixes:

- Do not override existing interface data
- Keep interface type indicator. Discover ONT interfaces in separate method.

Improvements:

- Use netmiko_args function from napalm.base.netmiko_helper

Bugfixes:

- Always return dict not list
- Fix LLDP remote port for HP Procurve switch neighbors
- Fix typo in method name get_software_mgmt_version_etsi

Improvements:

- Use global variables for regex
- Run Black for linting code

New features: