Adds a new command_timeout_factor argument to the
agent client _command method with a default value of 1,
and sets the install_bootloader command to send a value of 2
to extend the timeout factor to give the agent time to complete
its work before giving up on installing the bootloader and
automatically retrying.
Change-Id: Iab72903c3d30b0ae5b80a5115fc635179869eeee
Story: 2007483
Task: 39201
4829df2966