[Network] Added missing paths to LoadBalancer, NetworkInterface and VirtualNetworkGateway

[AutorestCI]

Generated from RestAPI PR: Azure/azure-rest-api-specs#1468

[codecov-io]

Codecov Report

Merging #1338 into master will decrease coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1338      +/-   ##
==========================================
- Coverage   56.05%   55.87%   -0.18%     
==========================================
  Files        2692     2708      +16     
  Lines       71250    71810     +560     
==========================================
+ Hits        39936    40126     +190     
- Misses      31314    31684     +370

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%)	⬇️
...2017_06_01/operations/load_balancers_operations.py	95.93% <0%> (ø)	⬆️
.../v2017_06_01/operations/route_tables_operations.py	95.93% <0%> (ø)	⬆️
...017_06_01/operations/packet_captures_operations.py	12.32% <0%> (ø)	⬆️
...re/mgmt/network/v2017_06_01/models/route_filter.py	50% <0%> (ø)	⬆️
.../virtual_network_gateway_connections_operations.py	10.91% <0%> (ø)	⬆️
...express_route_circuit_authorizations_operations.py	98% <0%> (ø)	⬆️
...6_01/operations/application_gateways_operations.py	9.05% <0%> (ø)	⬆️
... and 50 more

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[lmazuel]

Replaced by #1373