Update azure-template to reflect py27 only updates (#24285)

Author: scbedd

sdk/template/azure-template/setup.cfg

@@ -43,13 +43,13 @@
     classifiers=[
         "Development Status :: 4 - Beta",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
+        "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",
+        "Programming Language :: Python :: 3.10",
         "License :: OSI Approved :: MIT License",
     ],
     packages=find_packages(
@@ -65,9 +65,7 @@
     install_requires=[
         "azure-core<2.0.0,>=1.10.0",
     ],
-    extras_require={
-        ":python_version<'3.0'": ["azure-nspkg"],
-    },
+    python_requires=">=3.6",
     project_urls={
         "Bug Reports": "https://github.com/Azure/azure-sdk-for-python/issues",
         "Source": "https://github.com/Azure/azure-sdk-python",