There are cases where lustre stripe info is not available the
first time a given file is opened (e.g., when using the
llapi_file_create call). So, now we call into the lustre module
every time a file is opened to give the module a chance to gather
data.

fixed bugs that prevented record names from mapping to file systems in darshan-util; also fixed thread safety and deadlock issues

implemented a simple get_output_data that doesn't use MPI; all ranks except rank0 just drop their shared records

partly working lustre module supporting ost mapping; shared file agg still doesn't work, and log parsing doesn't either

added filename hashing so multiple opens/closes don't create multiple lustre-mod records; added proper reducer so that shared files are flattened into a single set of counters whose values are dictated by rank 0

the POSIX module will call into the Lustre module for each file
record created that corresponds to a file from a Lustre FS. No
counters are currently stored but most of the module strucutre
has been stubbed.