Revert the last two mock PRs (#7903)

* Revert "Do not require mock in Python 3 in certbot module (#7895)"

This reverts commit 77871ba71c.

* Revert "Do not require mock in Python 3 in acme module (#7894)"

This reverts commit cd0acf5dcc.

certbot/setup.py

@@ -47,6 +47,7 @@ install_requires = [
     # 1.1.0+ is required to avoid the warnings described at
     # https://github.com/certbot/josepy/issues/13.
     'josepy>=1.1.0',
+    'mock',
     'parsedatetime>=1.3',  # Calendar.parseDT
     'pyrfc3339',
     'pytz',
@@ -61,8 +62,7 @@ install_requires = [
 # So this dependency is not added for old Linux distributions with old setuptools,
 # in order to allow these systems to build certbot from sources.
 pywin32_req = 'pywin32>=227'  # do not forget to edit pywin32 dependency accordingly in windows-installer/construct.py
-setuptools_known_environment_markers = (StrictVersion(setuptools_version) >= StrictVersion('36.2'))
-if setuptools_known_environment_markers:
+if StrictVersion(setuptools_version) >= StrictVersion('36.2'):
     install_requires.append(pywin32_req + " ; sys_platform == 'win32'")
 elif 'bdist_wheel' in sys.argv[1:]:
     raise RuntimeError('Error, you are trying to build certbot wheels using an old version '
@@ -73,14 +73,6 @@ elif os.name == 'nt':
     # setuptools, pywin32 will not be specified as a dependency.
     install_requires.append(pywin32_req)
 
-if setuptools_known_environment_markers:
-    install_requires.append('mock ; python_version < "3.3"')
-elif 'bdist_wheel' in sys.argv[1:]:
-    raise RuntimeError('Error, you are trying to build certbot wheels using an old version '
-                       'of setuptools. Version 36.2+ of setuptools is required.')
-elif sys.version_info < (3,3):
-    install_requires.append('mock')
-
 dev_extras = [
     'coverage',
     'ipdb',