LU-5659 hsm: add timestamps to lhsmtool log messages

LU-5659 hsm: add timestamps to lhsmtool log messages

Add epoch timestamps (secs.usecs) to the log messages emitted by
lhsmtool_posix. Change the single use of CT_DEBUG() to
CT_TRACE(). Remove the unused macro CT_PRINTF().

This is a backport to b2_5 of
Lustre-change: http://review.whamcloud.com/#/c/12042/3
Lustre-commit: b23357064aba6022237dd146c33725529069770d

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I227d00c97f93a09ac9322213d255102b8a3cf612
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/12368
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>