Bug 1452179: [mozharness] Use `python -m easy_install` to run easy_install; r=bhearsum

Differential Revision: https://phabricator.services.mozilla.com/D964

--HG--
extra : rebase_source : efc5ad2611fb5c756be31b36d19a17ae762c808e

testing/mozharness/configs/talos/windows_config.py

@@ -19,8 +19,6 @@ config = {
     "virtualenv_modules": ['pywin32', 'talos', 'mozinstall'],
     "exes": {
         'python': PYTHON,
-        'easy_install': ['%s/scripts/python' % VENV_PATH,
-                         '%s/scripts/easy_install-2.7-script.py' % VENV_PATH],
         'mozinstall': ['%s/scripts/python' % VENV_PATH,
                        '%s/scripts/mozinstall-script.py' % VENV_PATH],
         'hg': os.path.join(os.environ['PROGRAMFILES'], 'Mercurial', 'hg'),

testing/mozharness/configs/talos/windows_vm_config.py

@@ -19,8 +19,6 @@ config = {
     "virtualenv_modules": ['pywin32', 'talos', 'mozinstall'],
     "exes": {
         'python': PYTHON,
-        'easy_install': ['%s/scripts/python' % VENV_PATH,
-                         '%s/scripts/easy_install-2.7-script.py' % VENV_PATH],
         'mozinstall': ['%s/scripts/python' % VENV_PATH,
                        '%s/scripts/mozinstall-script.py' % VENV_PATH],
         'hg': os.path.join(os.environ['PROGRAMFILES'], 'Mercurial', 'hg'),

testing/mozharness/mozharness/base/python.py

@@ -242,10 +242,7 @@ class VirtualenvMixin(object):
                 # not understood by easy_install.
                 self.install_module(requirements=requirements,
                                     install_method='pip')
-            # Allow easy_install to be overridden by
-            # self.config['exes']['easy_install']
-            default = 'easy_install'
-            command = self.query_exe('easy_install', default=default, return_type="list")
+            command = [self.query_python_path(), '-m', 'easy_install']
         else:
             self.fatal("install_module() doesn't understand an install_method of %s!" % install_method)