GPIO valve: add configuration interface

Add configuration interface for GPIO based valve where the valve's open
status is depicted by a GPIO. This configuration will be consumed by
ValveMonitor serv

GPIO valve: add configuration interface

Add configuration interface for GPIO based valve where the valve's open
status is depicted by a GPIO. This configuration will be consumed by
ValveMonitor service which will be added to dbus-sensors repository.

Change-Id: I79374eba4fd80e2fe3876aad1c47cbefb72c93ca
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>

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