[NX-OS]: Use management vrf by default for VPCDomain if not specified

[felix-kaestner]

This patch defaults the vrf to use for the keepalive link of the VPCDomain in Cisco NX-OS to use the "management" vrf. This reflects the default used by the device¹.

Footnotes

1. https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/106x/configuration/interfaces/cisco-nexus-9000-series-nx-os-interfaces-configuration-guide-release-106x/m_configuring_vpcs_9x.html#:~:text=the%20system%20uses%20the%20management%20VRF%20by%20default ↩

[github-actions]

Merging this branch will decrease overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos	10.92% (-0.01%)	👎

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/grpc.go	13.33% (ø)	15	2	13
github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/provider.go	0.07% (-0.00%)	1477 (+1)	1	1476 (+1)	👎
github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/vpc.go	12.00% (ø)	25	3	22
github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/vrf.go	100.00% (ø)	6	6	0

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/dns_test.go
• github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/intf_test.go
• github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/ntp_test.go
• github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/snmp_test.go
• github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/syslog_test.go
• github.com/ironcore-dev/network-operator/internal/provider/cisco/nxos/vpc_test.go