[Network] Updating of NSG and LB subitems specs

[AutorestCI]

Generated from RestAPI PR: Azure/azure-rest-api-specs#1442

[codecov-io]

Codecov Report

Merging #1316 into master will increase coverage by 0.01%.
The diff coverage is 20%.

@@            Coverage Diff             @@
##           master    #1316      +/-   ##
==========================================
+ Coverage   55.96%   55.97%   +0.01%     
==========================================
  Files        2682     2695      +13     
  Lines       71088    71437     +349     
==========================================
+ Hits        39782    39986     +204     
- Misses      31306    31451     +145

Impacted Files	Coverage Δ
azure-mgmt-network/azure/mgmt/network/__init__.py	47.84% <20%> (-0.77%)	⬇️
azure-batch/azure/batch/models/resize_error.py	57.14% <0%> (-42.86%)	⬇️
...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%)	⬇️
...ions/express_route_service_providers_operations.py	93.75% <0%> (ø)	⬆️
.../operations/virtual_network_gateways_operations.py	19.06% <0%> (ø)	⬆️
...01/operations/express_route_circuits_operations.py	67.24% <0%> (ø)	⬆️
azure-batch/azure/batch/models/compute_node.py	100% <0%> (ø)	⬆️
...06_01/models/network_interface_ip_configuration.py	100% <0%> (ø)	⬆️
...17_06_01/operations/network_watchers_operations.py	7.18% <0%> (ø)	⬆️
... and 60 more

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[lmazuel]

Replaced by #1373