Code review comment for ~danilogondolfo/network-manager/+git/network-manager:lp2023183

We seem to be hitting the race condition described in the comments in debian/tests/network_test_base.py on arm64. A few tests are consistently failing there.

Increasing the waiting time between creating and reading the veth pair MAC address seems to fix the issue.

It would be good to have this in mantic as well if possible.

Without the extra waiting time:

https://autopkgtest.ubuntu.com/results/autopkgtest-mantic-danilogondolfo-network-manager2/mantic/arm64/n/network-manager/20231025_194552_7ade5@/log.gz

With the extra waiting time:

https://autopkgtest.ubuntu.com/results/autopkgtest-mantic-danilogondolfo-network-manager2/mantic/arm64/n/network-manager/20231025_220809_b5452@/log.gz

https://autopkgtest.ubuntu.com/results/autopkgtest-mantic-danilogondolfo-network-manager2/mantic/arm64/n/network-manager/20231025_230748_f5cb2@/log.gz