{Core} Load vnet/subnet global definition for local context by default

[arrownj]

Description
We will support vnet/subnet for local context by default just as resource_group do. If the argument name is defined as vnet_name and subnet, it will support local context GET action automatically.

Testing Guide

• az local-context on

Command group 'local-context' is experimental and not covered by customer support. Please use with discretion.
Local context is turned on, you can run az local-context off to turn it off.

• az network vnet create -g myRG -n my-vnet-1 --subnet-name my-subnet-1

Local context is turned on. Its information is saved in working directory D:\code\cli\azure-cli. You can run az local-context off to turn it off.
Command argument values saved to local context: --resource-group: xiaojianxu, --name: xxj-vnet-1, --subnet-name: xxj-subnet-1
{
"newVNet": {
"addressSpace": {
"addressPrefixes": [
"10.0.0.0/16"
]
},
...
}

• az acr network-rule add -h

Command
az acr network-rule add : Add a network rule.

Arguments
--name -n [Required] : The name of the container registry. You can configure the default
registry name using az configure --defaults acr=<registry name>.
--ip-address : IPv4 address or CIDR range.
--resource-group -g : Name of resource group. You can configure the default group using az configure --defaults group=<name>. Local Context: myRG.
--subnet : Name or ID of subnet. If name is supplied, --vnet-name must be
supplied. Local Context: my-subnet-1.
--vnet-name : Name of a virtual network. Local Context: my-vnet-1.

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change.
[Component Name 2] az command b: Add some customer-facing feature.

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[arrownj]

local context

[jiasli]

This is somehow contradicting my understanding about vnet_name and subnet. But, yea, they can only be configured as global arguments.