Convert datetime objects to ISO8601 on the way out

If a plugin iterates a datetime object, decode to ISO-8601 string
on the way out.  This allows plugins to work directly with datetime
objects and allow the messaging layer to normalize it to ISO-8601

confluent_client/confluent/tlvdata.py

@@ -16,6 +16,7 @@
 # limitations under the License.
 
 import confluent.tlv as tlv
+from datetime import datetime
 import json
 import struct
 
@@ -34,6 +35,8 @@ def unicode_dictvalues(dictdata):
     for key in dictdata:
         if isinstance(dictdata[key], str):
             dictdata[key] = decodestr(dictdata[key])
+        elif isinstance(dictdata[key], datetime):
+            dictdata[key] = dictdata[key].strftime('%Y-%m-%dT%H:%M:%S')
         elif isinstance(dictdata[key], list):
             for i in xrange(len(dictdata[key])):
                 if isinstance(dictdata[key][i], str):

confluent_server/confluent/messages.py

@@ -19,6 +19,7 @@
 # Things are defined here to 'encourage' developers to coordinate information
 # format.  This is also how different data formats are supported
 import confluent.exceptions as exc
+from datetime import datetime
 import json
 
 valid_health_values = set([
@@ -36,6 +37,8 @@ def _htmlify_structure(indict):
             ret += "<li>{0}: ".format(key)
             if type(indict[key]) in (str, unicode, float, int):
                 ret += str(indict[key])
+            elif isinstance(indict[key], datetime):
+                ret += indict[key].strftime('%Y-%m-%dT%H:%M:%S')
             else:
                 ret += _htmlify_structure(indict[key])
     elif isinstance(indict, list):