i=wangyb
i=jack

- allow the download functions to take a "force" argument to force a download
  even if we have the file locally (maybe it's corrupt or something)
- download_srpm() should respect the $DOWNLOAD variable
- better detect failed downloads
- return failure if the untar of the OFED tarball fails
- gather diagnostic info if configure for lustre fails
- handle OFED RC and daily release filenames which have an extra tag appended
  to them
- move the kernel-ib-devel unpacking to outside the building function so that
  it's unpacked even if a cached build is used
- properly return failure if build_lustre() fails
- wipe the KABI whitelist when building the RHEL5 kernel as we do indeed alter
  the KABI by using an external OFED stack instead of the inkernel OFED stack
- replace a perl s/// usage with sed for efficiency and portability