[key vault] improve python readme and add multiapi client generation (#9870)

* fix python flags and add multiapi generation

* temp

* temp

* kv changes

* revert change to main readme

* update changelog from 7.1-preview to 7.1

Author: iscai-msft

specification/keyvault/data-plane/readme.python.md

@@ -4,65 +4,67 @@ These settings apply only when `--python` is specified on the command line.
 Please also specify `--python-sdks-folder=<path to the root directory of your azure-sdk-for-python clone>`.
 Use `--python-mode=update` if you already have a setup.py and just want to update the code itself.
 
-``` yaml $(python)
+``` yaml
 python-mode: create
-python:
-  azure-arm: true
-  license-header: MICROSOFT_MIT_NO_VERSION
-  payload-flattening-threshold: 2
-  package-name: azure-keyvault
-  clear-output-folder: true
-  no-namespace-folders: true
+azure-arm: true
+license-header: MICROSOFT_MIT_NO_VERSION
+payload-flattening-threshold: 2
+package-name: azure-keyvault
+clear-output-folder: true
+no-namespace-folders: true
 ```
 
 ### Python multi-api
 
 Generate all API versions currently shipped for this package
 
-```yaml $(python) && $(multiapi)
+```yaml $(multiapi)
 batch:
-  - tag: package-7.2-preview
-  - tag: package-7.1
-  - tag: package-7.0
-  - tag: package-2016-10
+- tag: package-2016-10
+- tag: package-7.0
+- tag: package-7.1
+- tag: package-7.2-preview
+- multiapiscript: true
 ```
 
-### Tag: package-7.2-preview and python
+``` yaml $(multiapiscript)
+output-folder: $(python-sdks-folder)/keyvault/azure-keyvault/azure/keyvault/
+clear-output-folder: false
+perform-load: false
+```
+
+### Tag: package-7.2-preview
 
-These settings apply only when `--tag=package-7.2-preview --python` is specified on the command line.
+These settings apply only when `--tag=package-7.2-preview` is specified on the command line.
 
-``` yaml $(tag) == 'package-7.2-preview' && $(python)
-python:
-  namespace: azure.keyvault.v7_2
-  output-folder: $(python-sdks-folder)/keyvault/azure-keyvault/azure/keyvault/v7_2_preview
+``` yaml $(tag) == 'package-7.2-preview'
+namespace: azure.keyvault.v7_2
+output-folder: $(python-sdks-folder)/keyvault/azure-keyvault/azure/keyvault/v7_2_preview
 ```
 
-### Tag: package-7.1 and python
+### Tag: package-7.1
 
-These settings apply only when `--tag=package-7.1 --python` is specified on the command line.
+These settings apply only when `--tag=package-7.1` is specified on the command line.
 
-``` yaml $(tag) == 'package-7.1' && $(python)
-python:
-  namespace: azure.keyvault.v7_1
-  output-folder: $(python-sdks-folder)/keyvault/azure-keyvault/azure/keyvault/v7_1_preview
+``` yaml $(tag) == 'package-7.1'
+namespace: azure.keyvault.v7_1
+output-folder: $(python-sdks-folder)/keyvault/azure-keyvault/azure/keyvault/v7_1
 ```
 
-### Tag: package-7.0 and python
+### Tag: package-7.0
 
-These settings apply only when `--tag=package-7.0 --python` is specified on the command line.
+These settings apply only when `--tag=package-7.0` is specified on the command line.
 
-``` yaml $(tag) == 'package-7.0' && $(python)
-python:
+``` yaml $(tag) == 'package-7.0'
   namespace: azure.keyvault.v7_0
   output-folder: $(python-sdks-folder)/keyvault/azure-keyvault/azure/keyvault/v7_0
 ```
 
-### Tag: package-2016-10 and python
+### Tag: package-2016-10
 
-These settings apply only when `--tag=package-2016-10 --python` is specified on the command line.
+These settings apply only when `--tag=package-2016-10` is specified on the command line.
 
-``` yaml $(tag) == 'package-2016-10' && $(python)
-python:
+``` yaml $(tag) == 'package-2016-10'
   namespace: azure.keyvault.v2016_10_01
   output-folder: $(python-sdks-folder)/keyvault/azure-keyvault/azure/keyvault/v2016_10_01
-```
+```