[jboss-as7-dev] making child-type in read-children-names optional

The intent is to read children names of the current node/address. With child-type required it complicates things (the most difficult would be to get a list of root node names since there is no common type for them). So, can we make child-type optional? In the mean time, I've made it in the cli branch https://github.com/aloubyansky/jboss-as/commit/f0b3149fcd744b6968bd72162c... Thanks, Alexey