[Network] Reverted gateway references in VPN Gateway Connection

[AutorestCI]

Generated from RestAPI PR: Azure/azure-rest-api-specs#1493

[codecov-io]

Codecov Report

Merging #1341 into master will decrease coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1341      +/-   ##
==========================================
- Coverage   56.05%   55.87%   -0.18%     
==========================================
  Files        2692     2706      +14     
  Lines       71250    71782     +532     
==========================================
+ Hits        39936    40105     +169     
- Misses      31314    31677     +363

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%)	⬇️
.../operations/virtual_network_gateways_operations.py	17.98% <0%> (-1.09%)	⬇️
...re/mgmt/network/v2017_06_01/models/route_filter.py	50% <0%> (ø)	⬆️
.../azure/mgmt/network/v2017_06_01/models/__init__.py	100% <0%> (ø)	⬆️
.../operations/virtual_network_peerings_operations.py	16% <0%> (ø)	⬆️
...01/operations/local_network_gateways_operations.py	16% <0%> (ø)	⬆️
...e/mgmt/network/v2017_06_01/models/security_rule.py	100% <0%> (ø)	⬆️
...1/operations/bgp_service_communities_operations.py	37.5% <0%> (ø)	⬆️
...ions/express_route_service_providers_operations.py	93.75% <0%> (ø)	⬆️
... and 56 more

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[lmazuel]

Replaced by #1373