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/routing_table_unittest.cc b/routing_table_unittest.cc
index 746bec2..52c105e 100644
--- a/routing_table_unittest.cc
+++ b/routing_table_unittest.cc
@@ -7,13 +7,13 @@
 
 #include <vector>
 
-#include <base/logging.h>
 #include <base/memory/weak_ptr.h>
 #include <base/stl_util.h>
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
 
 #include "shill/byte_string.h"
+#include "shill/logging.h"
 #include "shill/mock_control.h"
 #include "shill/mock_rtnl_handler.h"
 #include "shill/routing_table.h"