LU-13810 tests: increase limit for 1g

LU-13810 tests: increase limit for 1g

With wide striping file has objects at all
OSTs. As ZFS acquires several Kb for each
inode, each OST reserves minimum qunit 1M
even without write. At clean system with
8 OSTs, it acquires 8MB after file creation.
Increase pool limit from 10M to 20M to
make sanity-quota_1g pass at ZFS with 8 OSTs.

HPE-bug-id: LUS-9349
Test-Parameters: env=ONLY=1g testlist=sanity-quota
Change-Id: I1286e57aadebdd665c51d965220961b1f758c6f5
Signed-off-by: Sergey Cheremencev <sergey.cheremencev@hpe.com>
Reviewed-on: https://review.whamcloud.com/39917
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>