For b/3381327: Save 159+ms for every launch of Books, YouTube, Movie Studio...

Before this CL, you will see in the logcat:
  698 StopWatch D StopWatch calcFileSHA1 time (us): 159162
  698 bcc I File opened. fd=45
  698 bcc I File closed. fd=45
  698 StopWatch D StopWatch calcFileSHA1 time (us): 19282
  ...
This CL also cleans up bcc's logcat.

Change-Id: I4e23b459eee0dc77ef186fb761a64d731a721517
diff --git a/lib/bcc/FileHandle.cpp b/lib/bcc/FileHandle.cpp
index db02741..7dcb065 100644
--- a/lib/bcc/FileHandle.cpp
+++ b/lib/bcc/FileHandle.cpp
@@ -54,7 +54,7 @@
         continue;
       }
 
-      LOGE("Unable to open %s in %s mode.  (reason: %s)\n",
+      LOGW("Unable to open %s in %s mode.  (reason: %s)\n",
            filename, open_mode_str[mode], strerror(errno));
 
       return -1;
@@ -93,11 +93,11 @@
     }
 
     // Good, we have open and lock the file correctly.
-    LOGI("File opened. fd=%d\n", mFD);
+    LOGV("File opened. fd=%d\n", mFD);
     return mFD;
   }
 
-  LOGE("Unable to open %s in %s mode.\n", filename, open_mode_str[mode]);
+  LOGW("Unable to open %s in %s mode.\n", filename, open_mode_str[mode]);
   return -1;
 }
 
@@ -106,7 +106,7 @@
   if (mFD >= 0) {
     flock(mFD, LOCK_UN);
     ::close(mFD);
-    LOGI("File closed. fd=%d\n", mFD);
+    LOGV("File closed. fd=%d\n", mFD);
     mFD = -1;
   }
 }