frrender: T6991: do not loose DHCP default route when no static route is defined

[c-po]

Change summary

The reason is that DHCP routes are not re-generated during FRRrender as long as there is no protocols static entry in the configuration at all. Move out the DHCP configuration read-in from the static section.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T6991

Related PR(s)

• Testsuite: T861: inform smoketest about this environment vyos-build#872
• frr: upgrade to 10.2 and migrate protocols to unified FRRender class #4227

How to test / Smoketest result

vyos@vyos:~$ touch /tmp/vyos.smoketests.hint
vyos@vyos:~$ /usr/libexec/vyos/tests/smoke/cli/test_protocols_static.py
test_01_static (__main__.TestProtocolsStatic.test_01_static) ... ok
test_02_static_table (__main__.TestProtocolsStatic.test_02_static_table) ... ok
test_03_static_vrf (__main__.TestProtocolsStatic.test_03_static_vrf) ... ok
test_04_static_multicast (__main__.TestProtocolsStatic.test_04_static_multicast) ... ok
test_05_dhcp_default_route (__main__.TestProtocolsStatic.test_05_dhcp_default_route) ... ok

----------------------------------------------------------------------
Ran 5 tests in 86.997s

OK

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

👍
No issues in PR Title / Commit Title

[github-actions]

CI integration 👍 passed!

Details

CI logs

• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed