Stop being noisy about including the bash completions.

Now most of the other noise is gone, we should probably quiet down too.

Bug: N/A
Test: `source build/envsetup.sh`
Change-Id: Ic5b169b1771163488e70d732276372efbf304bae

envsetup.sh

@@ -331,7 +331,6 @@ function addcompletions()
 
     for f in system/core/adb/adb.bash system/core/fastboot/fastboot.bash; do
         if [ -f $f ]; then
-            echo "including $f"
             . $f
         fi
     done