fdvalid was actually fdinvalid.

Thanks Ben.
Uniform handling of open_files for open/close/init.

o Fixes bug where chirp_fs_chirp_open would always give a fd back if chirp_reli_open failed.
o Fixes a bug where local's open_files were not initialized.
o Fixes a bug where chirp_fs_local_open's fd was not set in open_files[fd].fd.
Inverted logic.
indentation
Reorganize and remove unneeded headers.
whitespace