recovery: move log output to stdout

Recovery currently has a random mix of messages printed to stdout and
messages printed to stderr, which can make logs hard to read.  Move
everything to stdout.

Change-Id: Ie33bd4a9e1272e731302569cdec918e0534c48a6
diff --git a/recovery.cpp b/recovery.cpp
index b7fb616..d953397 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -920,8 +920,7 @@
     sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
 
     if (!sehandle) {
-        fprintf(stderr, "Warning: No file_contexts\n");
-        ui->Print("Warning:  No file_contexts\n");
+        ui->Print("Warning: No file_contexts\n");
     }
 
     device->StartRecovery();