[tool]update llc-quick-start-tool for py3 only (#22507)

* update for py3 only

* Update setup.py

Author: msyyc

scripts/quickstart_tooling_llc/template/README.md

@@ -16,7 +16,7 @@ python -m pip install {{ package_name }}
 
 #### Prequisites
 
-- Python 2.7, or 3.6 or later is required to use this package.
+- Python 3.6 or later is required to use this package.
 - You need an [Azure subscription][azure_sub] to use this package.
 - An existing {{ package_pprint_name }} instance.
 

scripts/quickstart_tooling_llc/template/dev_requirements.txt

@@ -2,7 +2,6 @@
 -e ../../../tools/azure-sdk-tools
 ../../core/azure-core
 ../../identity/azure-identity
-../../nspkg/{{ folder_first }}-{{ folder_second }}-nspkg
 aiohttp>=3.0;
 typing_extensions>=3.7.2
 asyncio;

scripts/quickstart_tooling_llc/template/sdk_packaging.toml

@@ -1,6 +1,5 @@
 [packaging]
 package_name = "{{ package_name }}"
-package_nspkg = "{{ folder_first }}-{{ folder_second }}-nspkg"
 package_pprint_name = "{{ package_pprint_name }}"
 package_doc_id = ""
 is_stable = false

scripts/quickstart_tooling_llc/template/setup.py

@@ -45,6 +45,7 @@
         "Programming Language :: Python",
         "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
@@ -64,5 +65,5 @@
         "msrest>=0.6.21",
         'six>=1.11.0',
     ],
-    python_requires=">=3.7",
+    python_requires=">=3.6",
 )