[Network] Correct parameter name and configuration for Radius server for VPNGat

[AutorestCI]

Generated from RestAPI PR: Azure/azure-rest-api-specs#1484

[codecov-io]

Codecov Report

Merging #1332 into master will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1332      +/-   ##
==========================================
- Coverage   56.05%   55.97%   -0.08%     
==========================================
  Files        2692     2695       +3     
  Lines       71250    71427     +177     
==========================================
+ Hits        39936    39984      +48     
- Misses      31314    31443     +129

Impacted Files	Coverage Δ
...7_06_01/models/effective_network_security_group.py	50% <0%> (-7.15%)	⬇️
...17_06_01/models/effective_network_security_rule.py	21.05% <0%> (-5.62%)	⬇️
...1/operations/bgp_service_communities_operations.py	37.5% <0%> (ø)	⬆️
.../virtual_network_gateway_connections_operations.py	10.91% <0%> (ø)	⬆️
...2017_06_01/operations/security_rules_operations.py	98% <0%> (ø)	⬆️
.../v2017_06_01/operations/route_tables_operations.py	95.93% <0%> (ø)	⬆️
...e/mgmt/network/v2017_06_01/models/security_rule.py	100% <0%> (ø)	⬆️
...t/network/v2017_06_01/models/patch_route_filter.py	38.46% <0%> (ø)	⬆️
...06_01/models/network_interface_ip_configuration.py	100% <0%> (ø)	⬆️
...mt/network/v2017_06_01/models/route_filter_rule.py	42.85% <0%> (ø)	⬆️
... and 32 more

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[lmazuel]

Replaced by #1373