Add suppport for retrieving machine name

This adds support for reading /etc/os-release, parsing out
OPENBMC_TARGET_MACHINE and returning this to the caller.

Change-Id: If2a419b9a77597686f5137efce97b1150142f181
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/Makefile.am b/Makefile.am
index 43f65aa..34e60bd 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -47,6 +47,7 @@
 	psu.cpp \
 	pcie_i2c.cpp \
 	entity_name.cpp \
+	machine_name.cpp \
 	handler.cpp \
 	util.cpp \
 	ipmi.cpp