native_types: string_path_wrapper: Don't escape all strings

Not all strings require escaping when appending them to a path. This
allows us to now append `openbmc_project` to `/xyz` and have
expected behavior.

Change-Id: I49a2ee100455cff4067dcf3df61f3e145231eeba
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/message/types.cpp b/test/message/types.cpp
index 5e4e982..d666008 100644
--- a/test/message/types.cpp
+++ b/test/message/types.cpp
@@ -76,11 +76,11 @@
 TEST(MessageTypes, ObjectPathOperatorSlash)
 {
     EXPECT_EQ(sdbusplus::message::object_path("/") / "abc",
-              sdbusplus::message::object_path("/_61bc"));
+              sdbusplus::message::object_path("/abc"));
     EXPECT_EQ(sdbusplus::message::object_path("/") / "abc",
-              sdbusplus::message::object_path("/_61bc"));
+              sdbusplus::message::object_path("/abc"));
     EXPECT_EQ(sdbusplus::message::object_path("/abc") / "def",
-              sdbusplus::message::object_path("/abc/_64ef"));
+              sdbusplus::message::object_path("/abc/def"));
     EXPECT_EQ(sdbusplus::message::object_path("/abc") / "-",
               sdbusplus::message::object_path("/abc/_2d"));
     EXPECT_EQ(sdbusplus::message::object_path("/abc") / " ",
@@ -88,7 +88,7 @@
     EXPECT_EQ(sdbusplus::message::object_path("/abc") / "/",
               sdbusplus::message::object_path("/abc/_2f"));
     EXPECT_EQ(sdbusplus::message::object_path("/abc") / "ab_cd",
-              sdbusplus::message::object_path("/abc/_61b_5fcd"));
+              sdbusplus::message::object_path("/abc/ab_cd"));
     EXPECT_EQ(sdbusplus::message::object_path("/abc") / "_ab_cd",
               sdbusplus::message::object_path("/abc/_5fab_5fcd"));
     EXPECT_EQ(sdbusplus::message::object_path("/abc") / "ab-c_d",
@@ -96,14 +96,14 @@
 
     // Test the std::string overload.  This is largely just for coverage
     EXPECT_EQ(sdbusplus::message::object_path("/") / std::string("abc"),
-              sdbusplus::message::object_path("/_61bc"));
+              sdbusplus::message::object_path("/abc"));
 }
 
 TEST(MessageTypes, ObjectPathOperatorSlashEqual)
 {
     sdbusplus::message::object_path path("/");
     path /= "abc";
-    EXPECT_EQ(path, sdbusplus::message::object_path("/_61bc"));
+    EXPECT_EQ(path, sdbusplus::message::object_path("/abc"));
 
     sdbusplus::message::object_path path2("/");
     path2 /= std::string("d-ef");