Sync oslo network utils

A new function was added to oslo-incubator for setting tcp keepalive
settings, and dependent projects can use it.

Ran update.py in oslo-incubator to copy changed modules into nova.
Removing synced changes for jsonutils because of issues with how
strings are encoded with simplejson that cause some of our unittests
to fail.

Changes are:
network_utils.py (which contains the function we need, others are deps)
edd73c9 Merge "Improve help strings"
fe3389e Improve help strings
8a0f567 Remove str() from LOG.* and exceptions
f61a4e7 Fix python26 compatibility for RFCSysLogHandler
da6d713 Revert setting oslo-incubator logs to INFO
0d18381 Set default log levels for oslo.messaging and oslo-incubator

gettextutils.py
9912e5d Add API for creating translation functions
6cc96d0 Fix test_gettextutils on Python 3

log.py
edd73c9 Merge "Improve help strings"
fe3389e Improve help strings
8a0f567 Remove str() from LOG.* and exceptions
f61a4e7 Fix python26 compatibility for RFCSysLogHandler
da6d713 Revert setting oslo-incubator logs to INFO
0d18381 Set default log levels for oslo.messaging and oslo-incubator

Current HEAD in OSLO:
----------------------------------------------
Merge: 2640847 e433899
Date:   Mon May 5 19:41:28 2014 +0000
Merge "Enable configuring tcp keepalive"
----------------------------------------------

Implements: blueprint configure-tcp-keepalive
Related-Bug: 1314129
Change-Id: Idd04ad4ad9a06ef76941dc5c1be41ac3ac8877a7
Merge "Sync oslo network utils"