Retry reading routing table (bsd)

[hurricanehrndz]

Similar to #1817, BSD base OSes will return "cannot allocate memory" errors when routing table is expanding.

Describe your changes

See issue #1681, this is an additional fix

Issue ticket number and link

Checklist

• [x] Is it a bug fix
• [ ] Is a typo/documentation fix
• [ ] Is a feature enhancement
• [ ] It is a refactor
• [ ] Created tests that fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

[hurricanehrndz]

@lixmal agreed you would think google's patch would be enough