meson support: remove code warnings 2

This commit contains code changes necessary to support the increased
warning level from Meson builds. Most changes are for unused variables.
to keep the review

meson support: remove code warnings 2

This commit contains code changes necessary to support the increased
warning level from Meson builds. Most changes are for unused variables.
to keep the review size manageable, this commit contains only control
changes (plus one in sensor-monitor).

Change-Id: Ie20f1d9028add4b605e4cc9fb230940710365706
Signed-off-by: Mike Capps <mikepcapps@gmail.com>

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control: set_parameter_from_group_max action

This action will write a D-Bus property value to the Manager's parameter
cache. The property value written is the maximum value of all the

control: set_parameter_from_group_max action

This action will write a D-Bus property value to the Manager's parameter
cache. The property value written is the maximum value of all the
configured groups. The value can be modified using the Modifier utility
class's expressions before storing it.

The use case for this is that this action would be configured to write a
parameter that could then be used by another action.

An example JSON config is:

{
"name": "set_parameter_from_group",
"parameter_name": "proc_0_throttle_temp",
"modifier": {
"operator": "minus",
"value": 4
}
}

This would read the maximum D-Bus property found in all the groups
configured for the action, subtract 4 from it, and then store it as a
Manager parameter under the name proc_0_throttle_temp.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I75d91110023e0de9908d694997676e4854917ea8

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