Use C++17 format for nested namespace definitions

Use the new C++17 format for defining nested namespaces in the
phosphor-regulators application.

The definition
namespace

Use C++17 format for nested namespace definitions

Use the new C++17 format for defining nested namespaces in the
phosphor-regulators application.

The definition
namespace A::B::C
{
...
}

is now equivalent to
namespace A
{
namespace B
{
namespace C
{
...
}
}
}

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I284055bc94578a45d04d3561f511c0e347a8ecef

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Create regulators action_utils namespace

Create the action_utils namespace for utility functions related to the
regulators action framework.

Create a function in that namespace

Create regulators action_utils namespace

Create the action_utils namespace for utility functions related to the
regulators action framework.

Create a function in that namespace that executes a vector of actions.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I22297435daad0d5f6ad61157c094938f0488f076

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