tests: adapt setup script for new posix copytool cmd line arguments.
tests: fix tests for Lustre-HSM.

tests have not been run for a long time on Lustre/HSM
and many of them were failing because of outdated grep in logs, etc.
Updated test script to fix them.
migration: creation time was overwritten.

Creation time was overwritten in migration policies.
rbh-config: seq does not support 0000 format on RHEL5.

replaced seq -w 0000 xxxx with a ls in /proc/fs/lustre/...
rbh-import: fix uninitialized structure.

This resulted in setting garbage as stripe info.