switched threading to multiprocessing

both really work the same for the Lock but this hopefully will
avoid confusing people into thinking we are threaded or thread safe
Also did pyflakes cleanup and made note why checksums import exists

lib/ansible/cache/memcached.py

@@ -19,8 +19,8 @@ import collections
 import os
 import sys
 import time
-import threading
 from itertools import chain
+from multiprocessing import Lock
 
 from ansible import constants as C
 from ansible.cache.base import BaseCacheModule
@@ -51,7 +51,7 @@ class ProxyClientPool(object):
         self._num_connections = 0
         self._available_connections = collections.deque(maxlen=self.max_connections)
         self._locked_connections = set()
-        self._lock = threading.Lock()
+        self._lock = Lock()
 
     def _check_safe(self):
         if self.pid != os.getpid():

lib/ansible/runner/connection_plugins/accelerate.py

@@ -15,13 +15,12 @@
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
-import json
 import os
 import base64
 import socket
 import struct
 import time
-import threading
+from multiprocessing import Lock
 from ansible.callbacks import vvv, vvvv
 from ansible.errors import AnsibleError, AnsibleFileNotFound
 from ansible.runner.connection_plugins.ssh import Connection as SSHConnection
@@ -36,7 +35,7 @@ from ansible import constants
 # multiple of the value to speed up file reads.
 CHUNK_SIZE=1044*20
 
-_LOCK = threading.Lock()
+_LOCK = Lock()
 
 class Connection(object):
     ''' raw socket accelerated connection '''
@@ -243,7 +242,7 @@ class Connection(object):
         ''' run a command on the remote host '''
 
         if sudoable and self.runner.become and self.runner.become_method not in self.become_methods_supported:
-            raise errors.AnsibleError("Internal Error: this module does not support running commands via %s" % self.runner.become_method)
+            raise AnsibleError("Internal Error: this module does not support running commands via %s" % self.runner.become_method)
 
         if in_data:
             raise AnsibleError("Internal Error: this module does not support optimized module pipelining")

lib/ansible/utils/__init__.py

@@ -19,9 +19,7 @@ import errno
 import sys
 import re
 import os
-import shlex
 import yaml
-import copy
 import optparse
 import operator
 from ansible import errors
@@ -29,8 +27,7 @@ from ansible import __version__
 from ansible.utils.display_functions import *
 from ansible.utils.plugins import *
 from ansible.utils.su_prompts import *
-from ansible.utils.hashing import secure_hash, secure_hash_s, checksum, checksum_s, md5, md5s
-from ansible.callbacks import display
+from ansible.utils.hashing import secure_hash, secure_hash_s, checksum, checksum_s, md5, md5s #unused here but 'reexported'
 from ansible.module_utils.splitter import split_args, unquote
 from ansible.module_utils.basic import heuristic_log_sanitize
 from ansible.utils.unicode import to_bytes, to_unicode
@@ -45,12 +42,11 @@ import pipes
 import random
 import difflib
 import warnings
-import traceback
 import getpass
 import subprocess
 import contextlib
-import threading
 import tempfile
+from multiprocessing import Lock
 
 from vault import VaultLib
 
@@ -64,7 +60,7 @@ LOOKUP_REGEX = re.compile(r'lookup\s*\(')
 PRINT_CODE_REGEX = re.compile(r'(?:{[{%]|[%}]})')
 CODE_REGEX = re.compile(r'(?:{%|%})')
 
-_LOCK = threading.Lock()
+_LOCK = Lock()
 
 try:
     # simplejson can be much faster if it's available
@@ -357,9 +353,6 @@ def path_dwim_relative(original, dirname, source, playbook_base, check=True):
     ''' find one file in a directory one level up in a dir named dirname relative to current '''
     # (used by roles code)
 
-    from ansible.utils import template
-
-
     basedir = os.path.dirname(original)
     if os.path.islink(basedir):
         basedir = unfrackpath(basedir)
@@ -552,8 +545,6 @@ def _clean_data_struct(orig_data, from_remote=False, from_inventory=False):
 def parse_json(raw_data, from_remote=False, from_inventory=False, no_exceptions=False):
     ''' this version for module return data only '''
 
-    orig_data = raw_data
-
     # ignore stuff like tcgetattr spewage or other warnings
     data = filter_leading_non_json_lines(raw_data)