update rails to 4.0.1
remove unittest dir
OobBranch::Client implements 4 action

===
    OobBranch::Client.new(client_ip).power_reset(oob_ip: xx,
                                                 oob_mac: yy)

- power_reset
- power_on
- power_off
- power_status
 #5827 oob-branch API 对接

- /1/oob/power_reset?{oob_ip,oob_mac,bootdev}
- /1/oob/power_on?{oob_ip,oob_mac}
- /1/oob/power_off?{oob_ip,oob_mac}
- /1/oob/power_status?{oob_ip,oob_mac}