regulators: Create System class

Create a C++ class that represents the entire computer system being
controlled and monitored by the BMC.

The system contains one or more chassis.  Chassis are large enclosures
that can be independently powered off and on by the BMC.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Iba40637a229c1787b017e7f19b011192621a5d23
diff --git a/phosphor-regulators/test/meson.build b/phosphor-regulators/test/meson.build
index 10dace9..5f68fba 100644
--- a/phosphor-regulators/test/meson.build
+++ b/phosphor-regulators/test/meson.build
@@ -17,6 +17,7 @@
     'rail_tests.cpp',
     'rule_tests.cpp',
     'sensor_monitoring_tests.cpp',
+    'system_tests.cpp',
     'write_verification_error_tests.cpp',
 
     'actions/action_environment_tests.cpp',