interface: Added SMART test results to OSD interface
servers: Added smart script parameter to OSD config.
servers: Added SMART test result to OSD ServiceData.
servers: Added OSD smart health test result to DIR status page.
servers: Added check of OSDs SMART test results to default OSP
servers: Fixed error in default OSP.
interface: Changed Smart Test Result to OSD Health Result and added WARNING as possible result.
servers: Changed parameter name from smart_script to health_script.
servers: Added color highlighting to OSD health status in DIR status page.
servers: Updated default OSP. An OSD with "warning" as health status is now treated as unhealthy.
servers: Renamed smart_health_test to osd_health_test.
contrib: Added osd health example script. The script supports RAID and single device configuartions.
servers: Improved exception handling in osd health status code.
doc: Added description of OSD health monitoring and health_script parameter to xtreemfs userguide
servers: Added health_script parameter to osd config file.
Merge branch 'master' into lkairies-osd-smart-status

Conflicts:
	doc/xtreemfs-userguide/xtfs-guide.pdf
servers: fixed log message in SortFQDNPolicy
servers: Added policy attribute for osd health status to FilterDefaultPolicy
docs: Added description of osd_healt_status policy attribute to the user guide
servers: Fixed false positives in osd health script