[Network] Convert Load Balancer and App Gateway Create to Dynamic Templates

[Travis Prescott (tjprescott)]

Closes #2198.

[Yugang Wang (yugangw-msft)]

Overall LGTM.

[Yugang Wang (yugangw-msft)]

This appears a dupe with the same declaration 8 lines above

[Yugang Wang (yugangw-msft)]

dupe with the same one 2 lines above?

[Yugang Wang (yugangw-msft)]

you can consider to reuse https://github.com/Azure/azure-cli/blob/master/src/command_modules/azure-cli-vm/azure/cli/command_modules/vm/_vm_utils.py#L49

[Codecov (codecov-io)]

Codecov Report

Merging #2668 into master will decrease coverage by 0.33%.
The diff coverage is 86.81%.

@@            Coverage Diff             @@
##           master    #2668      +/-   ##
==========================================
- Coverage   61.48%   61.14%   -0.34%     
==========================================
  Files         514      480      -34     
  Lines       26019    25673     -346     
  Branches     3898     3883      -15     
==========================================
- Hits        15997    15698     -299     
+ Misses       9079     9048      -31     
+ Partials      943      927      -16

Impacted Files	Coverage Δ
...ure/cli/command_modules/network/_client_factory.py	95.16% <ø> (-0.56%)	⬇️
...twork/azure/cli/command_modules/network/_params.py	92.53% <100%> (+0.16%)	⬆️
...work/azure/cli/command_modules/network/commands.py	98.98% <100%> (ø)	⬆️
...k/azure/cli/command_modules/network/_validators.py	63.63% <75%> (-0.17%)	⬇️
...etwork/azure/cli/command_modules/network/custom.py	62.83% <79.76%> (+1.2%)	⬆️
...e/cli/command_modules/network/_template_builder.py	84.04% <90.74%> (+11.54%)	⬆️
...cli-core/azure/cli/core/commands/client_factory.py	86.11% <0%> (ø)	⬆️
...ource/azure/cli/command_modules/resource/custom.py	55.1% <0%> (+0.49%)	⬆️
...-cli-role/azure/cli/command_modules/role/custom.py	19.47% <0%> (+1.57%)	⬆️
... and 1 more

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[Travis Prescott (tjprescott)]

Yugang Wang (@yugangw-msft) comments addressed.