Remove references to sys.version_info

We support Python 3.6 as a minimum now, making these checks no-ops.

Change-Id: Ie5297e3682834099d2a403652dd875654dc2224e

tools/install_venv.py

@@ -61,7 +61,6 @@ def main(argv):
     install = install_venv.InstallVenv(root, venv, pip_requires, test_requires,
                                        py_version, project)
     options = install.parse_args(argv)
-    install.check_python_version()
     install.check_dependencies()
     install.create_virtualenv(no_site_packages=options.no_site_packages)
     install.install_dependencies()

tools/install_venv_common.py

@@ -44,10 +44,6 @@ class InstallVenv(object):
         print(message % args, file=sys.stderr)
         sys.exit(1)
 
-    def check_python_version(self):
-        if sys.version_info < (2, 6):
-            self.die("Need Python Version >= 2.6")
-
     def run_command_with_code(self, cmd, redirect_output=True,
                               check_exit_code=True):
         """Runs a command in an out-of-process shell.