cubicweb #2745677 datafeed looping task can hang [validation pending]

DataFeedXMLParser.parse calls down to urllib2 without a timeout, which apparently means it can wait forever for a response. Not Good™.

priorityimportant
typebug
done in3.17.4
load0.250
load left0.000
closed by#75493f6ca586 [datafeed] add a timeout config option (closes #2745677)
patch[datafeed] add a timeout config option (closes #2745677) [applied]