API+STATSD: Fixes

Statsd:
* Increase retry timeout to 30 seconds to work around weird worker pause

API:
* Add modify and node-modify support (and kludge to wsme to make it work)
* Fix status codes for wsme (currently requires trunk version of wsme)

Change-Id: Ib5f30b0d6306c4105fd30a6ca588a89ba96d29ee
Merge "API+STATSD: Fixes"