MAINT: ENsure setuptools is imported first

Import setuptools first to avoid warnings and related issues

setup.cfg

@@ -284,7 +284,7 @@ multi_line_output=3
 include_trailing_comma=True
 use_parentheses=True
 line_length=79
-known_compat=statsmodels.compat.*
+known_compat=statsmodels.compat.*,setuptools,setuptools.*
 force_grid_wrap=0
 combine_as_imports=True
 force_sort_within_sections=True

setup.py

@@ -5,6 +5,9 @@
 pytest --cov=statsmodels statsmodels
 coverage html
 """
+from setuptools import Extension, find_packages, setup
+from setuptools.dist import Distribution
+
 from collections import defaultdict
 from distutils.command.clean import clean
 import fnmatch
@@ -14,12 +17,9 @@
 import sys
 
 import pkg_resources
-from setuptools import Extension, find_packages, setup
-from setuptools.dist import Distribution
 
 import versioneer
 
-
 try:
     # SM_FORCE_C is a testing shim to force setup to use C source files
     FORCE_C = int(os.environ.get('SM_FORCE_C', 0))
@@ -48,8 +48,8 @@
 upgrade {0} before installing or install into a fresh virtualenv.
 """
 for key in SETUP_REQUIREMENTS:
-    import importlib
     from distutils.version import LooseVersion
+    import importlib
     req_ver = LooseVersion(SETUP_REQUIREMENTS[key])
     try:
         mod = importlib.import_module(key)
@@ -204,8 +204,8 @@ def build_extensions(self):
 
     def _update_extensions(self):
         import numpy
-        from numpy.distutils.misc_util import get_info
         from numpy.distutils.log import set_verbosity
+        from numpy.distutils.misc_util import get_info
         set_verbosity(1)
 
         numpy_includes = [numpy.get_include()]