Correct fstab sed command
Correct fstab sed command

Previously it was changing the mountpoint version, but not removing
the /data from the path.

This change also uses `mount -a` rather than an explicit mount command
to be sure fstab is being used.

ManageIQ/manageiq-appliance,ManageIQ/manageiq-appliance,ManageIQ/manageiq-appliance