Tweaking log calls a bit.

-) Introducing gpr_vlog so to spare a few vsprintf later (at least one for now)
-) Renaming statistics/log.* to statistics/census_log.* to avoid collisions.
	Change on 2014/12/12 by nnoble <nnoble@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=81995756
diff --git a/Makefile b/Makefile
index 03de0aa..80a2e51 100644
--- a/Makefile
+++ b/Makefile
@@ -674,7 +674,7 @@
     src/core/statistics/census_rpc_stats.c \
     src/core/statistics/census_tracing.c \
     src/core/statistics/hash_table.c \
-    src/core/statistics/log.c \
+    src/core/statistics/census_log.c \
     src/core/statistics/window_stats.c \
     src/core/surface/byte_buffer.c \
     src/core/surface/byte_buffer_reader.c \
@@ -1592,7 +1592,7 @@
     src/core/statistics/census_rpc_stats.c \
     src/core/statistics/census_tracing.c \
     src/core/statistics/hash_table.c \
-    src/core/statistics/log.c \
+    src/core/statistics/census_log.c \
     src/core/statistics/window_stats.c \
     src/core/surface/byte_buffer.c \
     src/core/surface/byte_buffer_reader.c \