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/HACKING b/HACKING
index aeaa23d..a7e5fbf 100644
--- a/HACKING
+++ b/HACKING
@@ -109,7 +109,7 @@
   be caught by const reference in general.
 
 - When adding verbose log messages for debug purposes, use the SLOG marco and
-  its variants (see scope_logger.h for details).
+  its variants (see logging.h for details).
 
   - Choose the appropriate scope and verbose level for log messages. E.g.