LU-913 test: Framework needs to record the test filesystem.

LU-913  test:  Framework needs to record the test filesystem.

Add a section

file_system: XXX

to the node info in yaml.sh

Because this runs on the node being recorded it can use
node_fstypes $HOSTNAME
to fetch the filesystemtype of the local machine

Signed-off-by: Chris Gearing <chris.gearing@intel.com>
Change-Id: I721e4084096c75b69290959190526ca27b573e1b
Reviewed-on: http://review.whamcloud.com/4591
Tested-by: Hudson
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Li Wei <wei.g.li@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>