shill: Rename SMLOG to SLOG

Rewrite SMLOG as SLOG, thus saving many edits.  Change the location of
the SLOG macro to be memory_log.h, requiring includes to be rewritten
and reordered.  While we're rewriting includes, moving all assorted
logging includes into a generic shill/logging.h, thus saving future
logging changes from altering these includes ever again.

BUG=chromium-os:31145
TEST=Builds, unit tests still pass

Change-Id: Ie5129fcbdda87f3149460209a682c698b876b09a
Reviewed-on: https://gerrit.chromium.org/gerrit/29650
Commit-Ready: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Tested-by: Christopher Wiley <wiley@chromium.org>
diff --git a/wifi_service.cc b/wifi_service.cc
index d4fe48d..f131874 100644
--- a/wifi_service.cc
+++ b/wifi_service.cc
@@ -7,7 +7,6 @@
 #include <string>
 #include <utility>
 
-#include <base/logging.h>
 #include <base/stringprintf.h>
 #include <base/string_number_conversions.h>
 #include <base/string_split.h>
@@ -21,6 +20,7 @@
 #include "shill/error.h"
 #include "shill/event_dispatcher.h"
 #include "shill/ieee80211.h"
+#include "shill/logging.h"
 #include "shill/manager.h"
 #include "shill/metrics.h"
 #include "shill/nss.h"