veyron/services/mgmt: using camel case for constant names

Change-Id: Ic6315a18d2fbee39bfff97faceca15f7146c8f36
diff --git a/services/mgmt/node/impl/const.go b/services/mgmt/node/impl/const.go
index 081a7ed..5fa0c16 100644
--- a/services/mgmt/node/impl/const.go
+++ b/services/mgmt/node/impl/const.go
@@ -1,8 +1,16 @@
 package impl
 
-// Node manager environment variables.
 const (
-	PREVIOUS_ENV = "VEYRON_NM_PREVIOUS"
-	ORIGIN_ENV   = "VEYRON_NM_ORIGIN"
-	ROOT_ENV     = "VEYRON_NM_ROOT"
+	// PreviousEnv is the name of the environment variable that holds
+	// the path to the workspace that contains the previous version of
+	// the node manager.
+	PreviousEnv = "VEYRON_NM_PREVIOUS"
+	// OriginEnv is the name of the environment variable that holds the
+	// veyron name of the application repository that can be used to
+	// retrieve the node manager application envelope.
+	OriginEnv = "VEYRON_NM_ORIGIN"
+	// RootEnv is the name of the environment variable that holds the
+	// path to the directory in which node manager workspaces are
+	// created.
+	RootEnv = "VEYRON_NM_ROOT"
 )