Merge "Add validate-json tox target"

test-requirements.txt

+demjson

tools/validate-json.sh

+#!/bin/bash
+set -e
+
+TMPFILE=$(mktemp)
+ret=0
+
+function clean {
+    rm -f ${TMPFILE}
+}
+trap clean EXIT
+
+for f in $(find docker/ -type f -name '*.json');do
+    jsonlint -s ${f} >${TMPFILE}
+    egrep -q 'has errors$' ${TMPFILE} && { cat ${TMPFILE}; ret=1 ;}
+done
+
+cat ${TMPFILE}
+
+exit ${ret}

tox.ini

+[tox]
+skipsdist = True
+envlist = validate-json
+minversion = 1.6
+
+[testenv]
+deps = -r{toxinidir}/test-requirements.txt
+
+[testenv:validate-json]
+commands = 
+    {toxinidir}/tools/validate-json.sh