exportfs: change fsid parameter to string and expand parameter description
exportfs: change fsid parameter to string and expand parameter description

fsid need not be integer, but can also be a UUID or the string
"root". Add extended parameter description.

stevenraspudic/resource-agents,stevenraspudic/resource-agents,asp24/resource-agents,stevenraspudic/resource-agents,asp24/resource-agents,asp24/resource-agents