examples.wrappers: New wrapper time.sh.

New wrapper script: run process inside /usr/bin/time.
Signed-off-by: NRudá Moura <rmoura@redhat.com>

examples/wrappers/time.sh

+#!/bin/bash
+#
+# Run process inside time.
+#
+
+exec /usr/bin/time -o $AVOCADO_TEST_LOGDIR/time.log.$$ -- "$@"