EX-7601 tests: unaligned read tests

EX-7601 tests: unaligned read tests

This adds testing for handling unaligned reads and partial
chunk reads from compressed files.

Testing for writes and multi-client and racing tests will
be added later, but we put the checking function in
test-framework now so it's easy to use later.

Test-Parameters: trivial
Test-Parameters: testlist=sanity-compr env=ONLY="1001 1002",ONLY_REPEAT=10
Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Signed-off-by: Artem Blagodarenko <ablagodarenko@ddn.com>
Change-Id: I06217c8aeba75016aa4168f329026842dff1d979
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51841
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>