EX-8671 tests: use smaller files in sanity-pcc/103+104

EX-8671 tests: use smaller files in sanity-pcc/103+104

Running fallocate is fast, but the actual PCC data copy may be slow.
Use smaller test files for sanity-pcc test_103 and test_104 to speed
up testing, and also wait longer in case the copy is slow.

Add some extra debugging on failure so we can see the file attach
state on failure, in case there is something wrong with the parsing.

Test-Parameters: trivial testlist=sanity-pcc
Test-Parameters: testlist=sanity-pcc env=ONLY=103,ONLY_REPEAT=100
Test-Parameters: testlist=sanity-pcc env=ONLY=104,ONLY_REPEAT=100
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I09f159810a778b8ef2bab93d0e2869237a3ebbe5
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53212
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Feng Lei <flei@whamcloud.com>