Change the logger PMDA config file lines to be of the form "NAME PATHNAME".
src/pmdas/logger/logger.c (valid_pmns_name): New function.
(read_config): Read NAME and PATHNAME from each config file line.
Make sure NAME is a valid PMNS name.
src/pmdas/logger/Install: Ask for logfile names along with paths.
src/pmdas/logger/event.h: Swap the order of the logfile name and
pathname to mirror the new config file.
Change the logger PMDA config file lines to be of the form "NAME PATHNAME".