LU-12707 obdecho: avoid panic with partially object init

LU-12707 obdecho: avoid panic with partially object init

in some cases (like ENOMEM) init function can't called, so
any init related code should placed in the object delete handler,
not in the object free.

Signed-off-by: Alexey Lyashkov <c17817@cray.com>
Change-Id: I1fca56423de9a045aac2c495fbc45069c3bbc97c
Reviewed-on: https://review.whamcloud.com/35950
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>