Add auto-online test for ZED/FMA as part of the ZTS

Automated auto-online test to go along with ZED FMA integration (PR 4673)
auto_online_001.pos works with real devices (sd- and mpath) and with non-real
block devices (loop) by adding a scsi_debug device to the pool

Note: In order for test group to run, ZED must not currently be running.
Kernel 3.16.37 or higher needed for scsi_debug to work properly
If timeout occurs on test using a scsi_debug device (error noticed on Ubuntu
system), a reboot might be needed in order for test to pass. (more
investigation into this)

Also suppressed output from is_real_device/is_loop_device/is_mpath_device -
was making the log file very cluttered with useless error messages
"ie /dev/mapper/sdc is not a block device" from previous patch

Reviewed-by: Don Brady <don.brady@intel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: David Quigley <david.quigley@intel.com>
Signed-off-by: Sydney Vanda <sydney.m.vanda@intel.com>
Closes #5774

zfs-script-config.sh.in

@@ -20,6 +20,7 @@ export ETCDIR=${SRCDIR}/etc
 export TESTSDIR=${SRCDIR}/tests
 export RUNFILEDIR=${TESTSDIR}/runfiles
 export UDEVRULEDIR=${BUILDDIR}/udev/rules.d
+export ZEDLETDIR=${SRCDIR}/cmd/zed/zed.d
 
 export ZDB=${CMDDIR}/zdb/zdb
 export ZFS=${CMDDIR}/zfs/zfs
@@ -32,6 +33,7 @@ export RAIDZ_TEST=${CMDDIR}/raidz_test/raidz_test
 export ARC_SUMMARY=${CMDDIR}/arc_summary/arc_summary.py
 export ARCSTAT=${CMDDIR}/arcstat/arcstat.py
 export DBUFSTAT=${CMDDIR}/dbufstat/dbufstat.py
+export ZED=${CMDDIR}/zed/zed
 
 export COMMON_SH=${SCRIPTDIR}/common.sh
 export ZFS_SH=${SCRIPTDIR}/zfs.sh