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/modem_manager.cc b/modem_manager.cc
index 4c06609..887b187 100644
--- a/modem_manager.cc
+++ b/modem_manager.cc
@@ -7,12 +7,12 @@
 #include <algorithm>
 
 #include <base/bind.h>
-#include <base/logging.h>
 #include <base/stl_util.h>
 #include <mm/mm-modem.h>
 #include <ModemManager/ModemManager-names.h>
 
 #include "shill/error.h"
+#include "shill/logging.h"
 #include "shill/modem.h"
 #include "shill/modem_manager_proxy.h"
 #include "shill/proxy_factory.h"