Create regulators IfAction class

Create the IfAction class that implements the "if" action in the JSON
config file.

See phosphor-regulators/docs/config_file/if.md for more information on
the "if" a

Create regulators IfAction class

Create the IfAction class that implements the "if" action in the JSON
config file.

See phosphor-regulators/docs/config_file/if.md for more information on
the "if" action.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I16d5ba7bb88b5baa8a5085168a8bd2dc75449e9b

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