T5756: L2TP RADIUS backup and weight settings (backport #3450)

[mergify]

Change Summary

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/T5756

Related PR(s)

Component(s) name

Proposed changes

How to test

Smoketest result

vyos@vyos:~$ python3 /usr//libexec/vyos/tests/smoke/cli/test_vpn_l2tp.py 
test_accel_ipv4_pool (__main__.TestVPNL2TPServer.test_accel_ipv4_pool) ... ok
test_accel_ipv6_pool (__main__.TestVPNL2TPServer.test_accel_ipv6_pool) ... 
WARNING: IPv4 Server requires gateway-address to be configured!


WARNING: 'default-ipv6-pool' is not defined

ok
test_accel_limits (__main__.TestVPNL2TPServer.test_accel_limits) ... ok
test_accel_local_authentication (__main__.TestVPNL2TPServer.test_accel_local_authentication) ... 
User "test" has rate-limit configured for only one direction but both
upload and download must be given!

ok
test_accel_name_servers (__main__.TestVPNL2TPServer.test_accel_name_servers) ... ok
test_accel_next_pool (__main__.TestVPNL2TPServer.test_accel_next_pool) ... 
WARNING: 'default-pool' is not defined

ok
test_accel_ppp_options (__main__.TestVPNL2TPServer.test_accel_ppp_options) ... ok
test_accel_radius_authentication (__main__.TestVPNL2TPServer.test_accel_radius_authentication) ... ok
test_accel_shaper (__main__.TestVPNL2TPServer.test_accel_shaper) ... ok
test_accel_snmp (__main__.TestVPNL2TPServer.test_accel_snmp) ... ok
test_accel_wins_server (__main__.TestVPNL2TPServer.test_accel_wins_server) ... ok
test_l2tp_radius_server (__main__.TestVPNL2TPServer.test_l2tp_radius_server) ... set vpn l2tp remote-access authentication mode radius
set vpn l2tp remote-access gateway-address 192.0.2.1
set vpn l2tp remote-access client-ip-pool SIMPLE-POOL range 192.0.2.0/24
set vpn l2tp remote-access default-pool SIMPLE-POOL
set vpn l2tp remote-access authentication radius server 192.0.2.22 key secretVyOS
set vpn l2tp remote-access authentication radius server 192.0.2.22 weight 10
set vpn l2tp remote-access authentication radius server 192.0.2.22 backup
del vpn l2tp remote-access
ok
test_l2tp_server_authentication_protocols (__main__.TestVPNL2TPServer.test_l2tp_server_authentication_protocols) ... ok
test_vpn_l2tp_dependence_ipsec_swanctl (__main__.TestVPNL2TPServer.test_vpn_l2tp_dependence_ipsec_swanctl) ... 
WARNING: 'default-pool' is not defined

ok

----------------------------------------------------------------------
Ran 14 tests in 58.672s

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

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This is an automatic backport of pull request #3450 done by [Mergify](https://mergify.com).