Remove extraneous timing messages from volumes.sh

Change: I3bbcc5b9f8a4da2fcdb9f6f70913c2d6bc6e2b9b
added some timing messages around the volume operations in
exercises/volumes.sh.  This was a good idea, but some
useless timing info was added to failed cases, this patch
pulls that back out.  The only parameter used to detect
failure is a timeout, so outputing the time elapses in
these cases is useless.

Change-Id: I609a803a7293aa8a8e3cec186984de59bfe9b409
diff --git a/exercises/volumes.sh b/exercises/volumes.sh
index 1c6320c..ffa12c4 100755
--- a/exercises/volumes.sh
+++ b/exercises/volumes.sh
@@ -158,8 +158,6 @@
 start_time=`date +%s`
 if ! timeout $ACTIVE_TIMEOUT sh -c "while ! nova volume-list | grep $VOL_NAME | grep available; do sleep 1; done"; then
     echo "Volume $VOL_NAME not created"
-    end_time=`date +%s`
-    echo "Failed volume-create after $((end_time - start_time)) seconds"
     exit 1
 fi
 end_time=`date +%s`
@@ -176,8 +174,6 @@
     die "Failure attaching volume $VOL_NAME to $NAME"
 if ! timeout $ACTIVE_TIMEOUT sh -c "while ! nova volume-list | grep $VOL_NAME | grep in-use; do sleep 1; done"; then
     echo "Volume $VOL_NAME not attached to $NAME"
-    end_time=`date +%s`
-    echo "Failed volume-attach after $((end_time - start_time)) seconds"
     exit 1
 fi
 end_time=`date +%s`
@@ -195,8 +191,6 @@
 nova volume-detach $VM_UUID $VOL_ID || die "Failure detaching volume $VOL_NAME from $NAME"
 if ! timeout $ACTIVE_TIMEOUT sh -c "while ! nova volume-list | grep $VOL_NAME | grep available; do sleep 1; done"; then
     echo "Volume $VOL_NAME not detached from $NAME"
-    end_time=`date +%s`
-    echo "Failed volume-detach after $((end_time - start_time)) seconds"
     exit 1
 fi
 end_time=`date +%s`
@@ -207,8 +201,6 @@
 nova volume-delete $VOL_ID || die "Failure deleting volume $VOL_NAME"
 if ! timeout $ACTIVE_TIMEOUT sh -c "while ! nova volume-list | grep $VOL_NAME; do sleep 1; done"; then
     echo "Volume $VOL_NAME not deleted"
-    end_time=`date +%s`
-    echo "Failed volume-delete after $((end_time - start_time)) seconds"
     exit 1
 fi
 end_time=`date +%s`