Switches call from deprecated function to renamed function.
Switches call from deprecated function to renamed function.

On a clean Fedora 25 install, Dec 2016, with the packages listed
in bootstrap-system.sh, attempting to compile results in an
error that 'Json::Reader::getFormatedErrorMessages() const' is
deprecated, and that 'Json::Reader::getFormattedErrorMessages()'
should be used instead. This commit switches the function call,
and successfully builds.

tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem