Leverage the next keyword from python 2.7

This is literally what the next keyword is for.
https://www.python.org/dev/peps/pep-3114/

Change-Id: I843755910b847737b077ff2361ba3e04409db0f0

.pydevproject

@@ -5,6 +5,6 @@
 <pydev_pathproperty name="org.python.pydev.PROJECT_SOURCE_PATH">
 <path>/git-repo</path>
 </pydev_pathproperty>
-<pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 2.6</pydev_property>
+<pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 2.7</pydev_property>
 <pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">Default</pydev_property>
 </pydev_project>

event_log.py

@@ -18,8 +18,6 @@ from __future__ import print_function
 import json
 import multiprocessing
 
-from pyversion import is_python3
-
 TASK_COMMAND = 'command'
 TASK_SYNC_NETWORK = 'sync-network'
 TASK_SYNC_LOCAL = 'sync-local'
@@ -73,7 +71,7 @@ class EventLog(object):
       A dictionary of the event added to the log.
     """
     event = {
-        'id': (kind, self._next_id.__next__() if is_python3() else self._next_id.next()),
+        'id': (kind, next(self._next_id)),
         'name': name,
         'task_name': task_name,
         'start_time': start,

repo

@@ -113,7 +113,7 @@ repodir = '.repo'                # name of repo's private directory
 S_repo = 'repo'                  # special repo repository
 S_manifests = 'manifests'        # special manifest repository
 REPO_MAIN = S_repo + '/main.py'  # main script
-MIN_PYTHON_VERSION = (2, 6)      # minimum supported python version
+MIN_PYTHON_VERSION = (2, 7)      # minimum supported python version
 GITC_CONFIG_FILE = '/gitc/.config'
 GITC_FS_ROOT_DIR = '/gitc/manifest-rw/'
 
@@ -152,9 +152,12 @@ def _print(*objects, **kwargs):
 # Python version check
 ver = sys.version_info
 if (ver[0], ver[1]) < MIN_PYTHON_VERSION:
-  _print('error: Python version %s unsupported.\n'
-         'Please use Python 2.6 - 2.7 instead.'
-         % sys.version.split(' ')[0], file=sys.stderr)
+  _print('error: Python version {} unsupported.\n'
+         'Please use Python {}.{} instead.'.format(
+             sys.version.split(' ')[0],
+             MIN_PYTHON_VERSION[0],
+             MIN_PYTHON_VERSION[1],
+         ), file=sys.stderr)
   sys.exit(1)
 
 home_dot_repo = os.path.expanduser('~/.repoconfig')
@@ -909,6 +912,6 @@ def main(orig_args):
 if __name__ == '__main__':
   if ver[0] == 3:
     _print('warning: Python 3 support is currently experimental. YMMV.\n'
-           'Please use Python 2.6 - 2.7 instead.',
+           'Please use Python 2.7 instead.',
            file=sys.stderr)
   main(sys.argv[1:])