dsdb_runner: Gracefully handle rollback failures.
dsdb_runner: Gracefully handle rollback failures.

This change attempts all rollback commands even if one of them
fails.  If any do fail they will be reported, but then control
returns back to the caller to (presumably) report whatever error
triggered the original rollback.

Reviewed-By: Gabor Gombas <3bb8c49439d9d044594e1c6967f991d0b4248a64@morganstanley.com>

quattor/aquilon,guillaume-philippon/aquilon,quattor/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,guillaume-philippon/aquilon,stdweird/aquilon,quattor/aquilon,stdweird/aquilon