EX-6127 tests: test compression without bzip2/HDF5

EX-6127 tests: test compression without bzip2/HDF5

Run as much of sanity test_460a compression tests as possible,
even if bunzip2 or HDF5 file are unavailable.

Print a clear message in test_84 if bunzip2 unavailable.

Fixes: f43b9ce9af ("EX-6127 osc: osc brw request compression")
Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I36251834f636600eb9b0194ccd14c8b203da32e5
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51532
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>