fix login for zabbix >=5.4

[ghormoon]

Since version 5.4, zabbix changed 'user' parameter name for 'username' in login method. Handling added to support versions >=5.4

[ghormoon]

mr updated with packaging.version.parse instead

[NoxInmortus]

If this fix zabbix-api for Zabbix 6.2 I would be glad!

[gescheit]

packaging is included in python:

>>> import packaging
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'packaging'

https://stackoverflow.com/a/11887825 this implementation is good enough for current problem.

[chrisallennc]

Is there an ETA for when this will be merged? With Zabbix 6.4 the "user" parameter has been removed and "username" must be used so this module cannot be used with 6.4+ https://www.zabbix.com/documentation/current/en/manual/api/changes#user

[rjorgenson-ns]

Also needing this update for an imminent upgrade to zabbix 6.4

[eliottcassidy2000]

+1, would be great to have this merged so we can use it with zabbix 6.4

[gescheit]

Fixed in #39