otautil: Factor out the utils that're private to recovery.

A number of utility functions are intended for serving recovery's own
use. Exposing them via libotautil (which is a static lib) would pass the
dependencies onto libotautil's users (e.g. recovery image, updater, host
simulator, device-specific recovery UI/updater extensions etc). This CL
finds a new home for the utils that are private to recovery.

Test: mmma bootable/recovery
Change-Id: I575e97ad099b85fe1c1c8c7c9458a5a43d4e11e1
diff --git a/recovery-refresh.cpp b/recovery-refresh.cpp
index d41755d..42acd05 100644
--- a/recovery-refresh.cpp
+++ b/recovery-refresh.cpp
@@ -38,11 +38,12 @@
 #include <string.h>
 #include <string>
 #include <private/android_logger.h> /* private pmsg functions */
-#include "otautil/logging.h"
+#include "recovery_utils/logging.h"
 int main(int argc, char **argv) {
     static const char filter[] = "recovery/";