A typical parameter of opal_output_verbose() is ORTE_NAME_PRINT(...),
which is an expensive macro.
Most of the time, this is unnecessary since the verbosity level is too high.
Make opal_output_verbose() a macro so such arguments are only evaluated if the
verbosity is low enough.
Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>