Currently a reboot bash script file is used to call reboot and
poweroff operation. Deleting this file and moving the code to
python file using utils.execute()
Partial-Bug: #1557542
Change-Id: Iad9cd9d15417e9a954d108d2759e6303452fca27
Author: Bharath kumar <shettybharath4@gmail.com>
Co-Authored-By: Annie Lezil <annie.lezil@gmail.com>