EX-2853 lamigo: initial supoprt for DoM

EX-2853 lamigo: initial supoprt for DoM

if src-dom option is specified, then lamigo will recognize
files with DoM component as files stored on "fast" storage
and consider them for replication.

Test-Parameters: testlist=hot-pools
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I471c3eb82d133c1d967772cf959bed84cab63ff4
Reviewed-on: https://review.whamcloud.com/43407
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>