Option to prevent FHRP group assignment from being overwritten (#445)

[afoster]

Added a per source config option (skip_fhrp_group_ips) to prevent FHRP group IP addresses in Netbox from being overridden by their members, as described in issue #445.

[bb-Ricardo]

Hi, and thank you very much for this PR.

I'm still a bit busy but soon will have some time to look at this. Don't worry, just need some more time.

[ionoci]

Hi @Noah418 or @afoster , thanks a lot for implementing this feature.
I wanted to try it with the development branch, but I get following error:

Traceback (most recent call last):
  File "/srv/netboxstuff/nbsync-devel/./netbox-sync.py", line 23, in <module>
    from module.sources import instantiate_sources
  File "/srv/netboxstuff/nbsync-devel/module/sources/__init__.py", line 11, in <module>
    from module.sources.vmware.connection import VMWareHandler
  File "/srv/netboxstuff/nbsync-devel/module/sources/vmware/connection.py", line 29, in <module>
    from module.sources.common.source_base import SourceBase
  File "/srv/netboxstuff/nbsync-devel/module/sources/common/source_base.py", line 449
    log.info(f"Ip address {grab(ip, "data.address")} is assigned to an FHRP Group and skip_fhrp_group_ips is set to {self.settings.skip_fhrp_group_ips}, skipping.")
                                     ^^^^
SyntaxError: f-string: unmatched '('

I fixed it by setting single ticks as quotation marks:
log.info(f"Ip address '{grab(ip, 'data.address')}' is assigned to an FHRP Group and skip_fhrp_group_ips is set to {self.settings.skip_fhrp_group_ips}, skipping.")

If I enable skip_fhrp_group_ips the synchronisation works and leaves FHRP group assignment as it is, BUT all IPs bound to VM interface will be unbound :(

how may I help debugging this?

Cheers
Ionoci

[semx]

I've opened #538 which builds on this PR (your commits included) and adds two fixes @ionoci reported: the py<3.12 SyntaxError that broke import, and the regression where skip_fhrp_group_ips unbound every interface IP (the FHRP check now runs before the matching loop, scoped to the same address+VRF, so it's order-independent). It also adds the first unit tests in the repo. Credited you and @afoster as co-authors.