LU-3694 utils: rewrite posix CT messages

LU-3694 utils: rewrite posix CT messages

This patch:
- rewrite messages to have a standard format
- add thread id to each message
- use stderr for trace, debug, error

Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Change-Id: If7ac03d1b8ed85a80608cf112925dc53a8839fb0
Reviewed-on: http://review.whamcloud.com/7568
Tested-by: Hudson
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>