tree b80c8156c69203afa1857044b9eb248e1fc336d9
parent 203189901e2997750914034d9a0432b06ea3d674
author Ray Milkey <ray@onlab.us> 1423101020 -0800
committer Gerrit Code Review <gerrit@onlab.us> 1423112362 +0000

Make JSON codecs immutable

The contract for JSON codecs requires that they have no
local context.  Make them all immutable, and test that they
stay immutable.

Change-Id: Ia3930b844ede231940da05699f5f08605f946e0c