Remove ordereddict as 2.6 is no longer supported

ordereddict, and a related workaround method, were removed as we no
longer support python 2.6. Collections contains ordereddict on newer
python versions.

Change-Id: I48cc55a5c56fbc1f71442fc858eb4905f0213988

ironic_python_agent/extensions/base.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import collections
 import functools
 import inspect
 import threading
@@ -22,7 +23,6 @@ import six
 
 from ironic_python_agent import encoding
 from ironic_python_agent import errors
-from ironic_python_agent import utils
 
 LOG = log.getLogger()
 
@@ -206,7 +206,7 @@ class BaseAgentExtension(object):
 class ExecuteCommandMixin(object):
     def __init__(self):
         self.command_lock = threading.Lock()
-        self.command_results = utils.get_ordereddict()
+        self.command_results = collections.OrderedDict()
         self.ext_mgr = None
 
     def get_extension(self, extension_name):

ironic_python_agent/utils.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import collections
 import copy
 import glob
 import os
@@ -46,15 +45,6 @@ SUPPORTED_ROOT_DEVICE_HINTS = set(('size', 'model', 'wwn', 'serial', 'vendor'))
 AGENT_PARAMS_CACHED = dict()
 
 
-def get_ordereddict(*args, **kwargs):
-    """A fix for py26 not having ordereddict."""
-    try:
-        return collections.OrderedDict(*args, **kwargs)
-    except AttributeError:
-        import ordereddict
-        return ordereddict.OrderedDict(*args, **kwargs)
-
-
 def execute(*cmd, **kwargs):
     """Convenience wrapper around oslo's execute() method."""
     result = processutils.execute(*cmd, **kwargs)

requirements.txt

@@ -6,7 +6,6 @@ Babel>=1.3
 eventlet>=0.17.4
 iso8601>=0.1.9
 netifaces>=0.10.4
-ordereddict
 oslo.config>=2.3.0 # Apache-2.0
 oslo.concurrency>=2.3.0 # Apache-2.0
 oslo.i18n>=1.5.0 # Apache-2.0