regulators: Add configure support to Chassis class

Implemented the configure() method in the Chassis class.  This method
configures all the regulator devices within the chassis.

Also made very minor fixes to two testcases.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Ib29fdfa36e59f6b79d9467cdc52c3c6fc9c6886d
diff --git a/phosphor-regulators/test/device_tests.cpp b/phosphor-regulators/test/device_tests.cpp
index 1ce065c..901f1cf 100644
--- a/phosphor-regulators/test/device_tests.cpp
+++ b/phosphor-regulators/test/device_tests.cpp
@@ -25,12 +25,12 @@
 #include "presence_detection.hpp"
 #include "rail.hpp"
 #include "rule.hpp"
-#include "sensor_monitoring.hpp"
 #include "system.hpp"
 #include "test_utils.hpp"
 
 #include <memory>
 #include <optional>
+#include <string>
 #include <utility>
 #include <vector>
 
@@ -243,10 +243,8 @@
         journal::clear();
         devicePtr->configure(system, *chassisPtr);
         std::vector<std::string> expectedDebugMessages{
-            "Configuring reg1",
-            "Configuring vdd0: volts=1.300000",
-            "Configuring vio0: volts=3.200000",
-        };
+            "Configuring reg1", "Configuring vdd0: volts=1.300000",
+            "Configuring vio0: volts=3.200000"};
         EXPECT_EQ(journal::getDebugMessages(), expectedDebugMessages);
         EXPECT_EQ(journal::getErrMessages().size(), 0);
     }