envsetup: Fix adb recovery state detections

* The original commands were checking a file,
    and validating that adb ran without error,
    resulting in an always-true result

 * Fix eat and _adb_connected by properly
    checking the 'test -e' error code

Change-Id: I49f82f04f4b51097be76f03bf7021203665da76f

build/envsetup.sh

@@ -108,10 +108,10 @@ function eat()
             return 1
         fi
         adb start-server # Prevent unexpected starting server message from adb get-state in the next line
-        if [ $(adb get-state) != device -a $(adb shell test -e /sbin/recovery 2> /dev/null; echo $?) != 0 ] ; then
+        if [ $(adb get-state) != device -a $(adb shell 'test -e /sbin/recovery 2> /dev/null; echo $?') != 0 ] ; then
             echo "No device is online. Waiting for one..."
             echo "Please connect USB and/or enable USB debugging"
-            until [ $(adb get-state) = device -o $(adb shell test -e /sbin/recovery 2> /dev/null; echo $?) = 0 ];do
+            until [ $(adb get-state) = device -o $(adb shell 'test -e /sbin/recovery 2> /dev/null; echo $?') = 0 ];do
                 sleep 1
             done
             echo "Device Found.."
@@ -782,7 +782,7 @@ function repodiff() {
 function _adb_connected {
     {
         if [[ "$(adb get-state)" == device &&
-              "$(adb shell test -e /sbin/recovery; echo $?)" != 0 ]]
+              "$(adb shell 'test -e /sbin/recovery; echo $?')" != 0 ]]
         then
             return 0
         fi