Conform regulator methods to acronym conventions

Change regulator class methods to conform to OpenBMC capitalization
conventions for acronyms.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I1eb5202685796cbc2d45cb6368ee4dbd4706e504
diff --git a/phosphor-regulators/test/rule_tests.cpp b/phosphor-regulators/test/rule_tests.cpp
index 6c32dc8..a350238 100644
--- a/phosphor-regulators/test/rule_tests.cpp
+++ b/phosphor-regulators/test/rule_tests.cpp
@@ -22,11 +22,11 @@
 TEST(RuleTests, Constructor)
 {
     Rule rule("set_voltage_rule");
-    EXPECT_EQ(rule.getId(), "set_voltage_rule");
+    EXPECT_EQ(rule.getID(), "set_voltage_rule");
 }
 
-TEST(RuleTests, GetId)
+TEST(RuleTests, GetID)
 {
     Rule rule("read_sensor_values");
-    EXPECT_EQ(rule.getId(), "read_sensor_values");
+    EXPECT_EQ(rule.getID(), "read_sensor_values");
 }