tree ff4b7899dfe2d91d4712cc3aae719926f8183212
parent 19e89ce419499cb9a8e0f67a66896bc69f360b5c
author Matt Spinler <spinler@us.ibm.com> 1573074085 -0600
committer Matt Spinler <spinler@us.ibm.com> 1575407274 -0600

PEL: Keep track of if host is running

Use the DataInterface class to keep track of if the host is up and
running by keeping track of the OperatingSystemState property on the
xyz.openbmc_project.State.OperatingSystem.Status interface on the
/xyz/openbmc_project/state/host0 object path.

Added a isHostUp() function as well as a subscribeToHostStateChange()
function to allow a user to pass in a function to be run when the host
changes state.

Property values of 'BootComplete' or 'Standby' mean that the host is
running, anything else is considered not running.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I096b2bc4014dff9be85a4bbd74ef27193fd338fb