Update documentation to indicate lattest pythonseamicroclient
package version(0.4.0). As earlier version did not have
get_boot_order feature implemented which is required in
get_boot_device to get the current boot device.
Change-Id: I765d26d08ef2bb2c3fe7487338cca9c3ed50cdc7
Closes-Bug: #1437227
ecf2ae8c5f