fix PVFSIOStore to compile and work with the plfs_error_t changes.
Merge pull request #344 from chuckcranor/plfsfix

fix PVFSIOStore to compile and work with the plfs_error_t changes.
finish incomplete update of HDFSIOstore for the plfs_error_t changes.
Merge pull request #348 from chuckcranor/hdfsfix

finish incomplete update of HDFSIOstore for the plfs_error_t changes.