Rename getPSUInventoryPath to getPSUInventoryPaths

Rename the utils method/function getPSUInventoryPath() to
getPSUInventoryPaths().  The method/function returns multiple paths in a
vector, so the name should be plural.  This will make the return type
more clear.  Currently the name implies only one path will be returned.

Tested:
* Verified all automated tests build and run successfully
* Verified getPSUInventoryPaths() returns correct data

Change-Id: I7e215c37e3ce1eb27313bc51348c7f7335c8f67a
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
diff --git a/src/utils.cpp b/src/utils.cpp
index 6b7f602..abea750 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -59,7 +59,8 @@
     return utils;
 }
 
-std::vector<std::string> Utils::getPSUInventoryPath(sdbusplus::bus_t& bus) const
+std::vector<std::string>
+    Utils::getPSUInventoryPaths(sdbusplus::bus_t& bus) const
 {
     std::vector<std::string> paths;
     try