Replace old sdist and wheel build command in validate

The new way of packaging a python project is via build package. This
patch replaces the old setup.py style sdist and wheel build.

Change-Id: Ia351d099aa3b2491e3a4d255d87bb7c6bd691cac

openstack_releases/pythonutils.py

@@ -94,7 +94,7 @@ def build_sdist(workdir, repo):
         'SKIP_GENERATE_AUTHORS': '1',
         'SKIP_WRITE_GIT_CHANGELOG': '1',
     }
-    cmd = [python, 'setup.py', 'sdist', 'bdist_wheel']
+    cmd = [python, '-m', 'build' '--sdist', '--wheel']
     processutils.check_call(
         cmd,
         cwd=dest,

requirements.txt

@@ -8,6 +8,7 @@
 #                                                                    #
 ######################################################################
 
+build>=0.7.0
 pbr>=1.6
 keyring>=7.3
 requests>=2.5.2