LU-7631 tests: add debug info to conf-sanity 82a

LU-7631 tests: add debug info to conf-sanity 82a

In the routine check_stripe_count, the different error
messages need to be modified so when an error occurs,
a user can tell what error was hit. Also, print precreated
object information at the beginning of the test and on
error.

Test-Parameters: trivial mdscount=2 mdtcount=4 testlist=conf-sanity envdefinitions=ONLY=82a
Test-Parameters: mdscount=1 mdtcount=1 testlist=conf-sanity envdefinitions=ONLY=82a

Lustre-change: https://review.whamcloud.com/33689
Lustre-commit: e76683a5bd540cacd2271a969aa9acd9bf790ccf

Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: Ifc75d52d38d9cb401118ef7baa4014bddf6298f2
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Emoly Liu <emoly@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/34294
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>