monitor: Fill in EpowPowerOff action

This action does the following:

1) Starts a service mode timer, which would allow the system to be
serviced before anything happens.
2) On the expiration of

monitor: Fill in EpowPowerOff action

This action does the following:

1) Starts a service mode timer, which would allow the system to be
serviced before anything happens.
2) On the expiration of that timer, it will:
a) Set the thermal fault alert D-Bus property. This will be used
to send an EPOW alert to the host on IBM systems.
b) Start the meltdown timer.
3) On the expiration of the meltdown timer, a hard power off will
occur. This timer cannot be canceled even if fans start behaving.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I9434699b816b23b68c6d9d1e97283b4ab9befe4f

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monitor: Create PowerOffRules class

This class contains a PowerOffCause and a PowerOffAction. It provides a
check() method that takes the FanHealth map which it then checks against
the cause. If t

monitor: Create PowerOffRules class

This class contains a PowerOffCause and a PowerOffAction. It provides a
check() method that takes the FanHealth map which it then checks against
the cause. If the cause is satisfied, it then starts the power off
action. It provides a cancel method that will force cancel a running
action in the case that the object owner detects a system power off and
so doesn't need to run this power off anymore.

The class's configuration data is read from the JSON config file.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I5c0c168591d6d62c894c4d036ec762797fd759af

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