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/arp_packet.cc b/arp_packet.cc
index 6b131ce..aca0715 100644
--- a/arp_packet.cc
+++ b/arp_packet.cc
@@ -9,7 +9,7 @@
 #include <netinet/in.h>
 #include <string.h>
 
-#include <base/logging.h>
+#include "shill/logging.h"
 
 namespace shill {