regulators: Implement log_phase_fault action

Implement the new log_phase_fault action in the JSON configuration file.

Create gtests to test the new class.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I53130b029967d0a0d7b7fdd9b12f69035b9f085e
diff --git a/phosphor-regulators/test/meson.build b/phosphor-regulators/test/meson.build
index 897e540..57200a4 100644
--- a/phosphor-regulators/test/meson.build
+++ b/phosphor-regulators/test/meson.build
@@ -40,6 +40,7 @@
     'actions/i2c_write_byte_action_tests.cpp',
     'actions/i2c_write_bytes_action_tests.cpp',
     'actions/if_action_tests.cpp',
+    'actions/log_phase_fault_action_tests.cpp',
     'actions/not_action_tests.cpp',
     'actions/or_action_tests.cpp',
     'actions/pmbus_read_sensor_action_tests.cpp',