Fixed an issue with IPMI interfaces with a default IP of 0.0.0.0/0, which can not be assigned within netbox.
Fixed a small typo:
(assigned_object and assigned_object_id != interface.id):
vs.
(assigned_object and assigned_object.id != interface.id):
about the cache to be re-enable for example
```
DEBUG:urllib3.connectionpool:https://netbox.local:443 "GET /api/dcim/inventory-items/?device_id=9&tag=hw-disk&limit=0 HTTP/1.1" 200 52
('A cache backup failure has occurred. Please execute the "reenablecache" '
'command')
Traceback (most recent call last):
File "/usr/bin/netbox_agent", line 33, in <module>
sys.exit(load_entry_point('netbox-agent==0.7.1', 'console_scripts', 'netbox_agent')())
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/cli.py", line 50, in main
return run(config)
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/cli.py", line 43, in run
server.netbox_create_or_update(config)
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/server.py", line 417, in netbox_create_or_update
self.inventory.create_or_update()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 547, in create_or_update
self.do_netbox_disks()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 417, in do_netbox_disks
disks = self.get_hw_disks()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 332, in get_hw_disks
for raid_card in self.get_raid_cards(filter_cards=True):
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 242, in get_raid_cards
self.raid = raid_class()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/raid/hp.py", line 180, in __init__
self.convert_to_dict()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/raid/hp.py", line 185, in convert_to_dict
controllers = _parse_ctrl_output(lines)
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/raid/hp.py", line 34, in _parse_ctrl_output
attr, val = line.split(': ', 1)
```
```
Traceback (most recent call last):
File "/usr/bin/netbox_agent", line 33, in <module>
sys.exit(load_entry_point('netbox-agent==0.7.1', 'console_scripts', 'netbox_agent')())
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/cli.py", line 50, in main
return run(config)
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/cli.py", line 43, in run
server.netbox_create_or_update(config)
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/server.py", line 417, in netbox_create_or_update
self.inventory.create_or_update()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 550, in create_or_update
self.do_netbox_disks()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 420, in do_netbox_disks
disks = self.get_hw_disks()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 344, in get_hw_disks
size = int(disk.get('size', 0))
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
```
