shill: Add Technology class

Move Technology enum out into its own class, and create static
functions for converting between these and strings.

BUG=chromium-os:20114
TEST=Rerun unit tests

Change-Id: I9e3aea44e5d0b14d844328f023b01d7f8ea04c42
Reviewed-on: http://gerrit.chromium.org/gerrit/8204
Reviewed-by: Paul Stewart <pstew@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
diff --git a/Makefile b/Makefile
index 05a2f6d..967696d 100644
--- a/Makefile
+++ b/Makefile
@@ -130,6 +130,7 @@
 	sockets.o \
 	supplicant_interface_proxy.o \
 	supplicant_process_proxy.o \
+	technology.o \
 	wifi.o \
 	wifi_endpoint.o \
 	wifi_service.o