veyron/services/mgmt/build/buildd: Bug fix for shell test.
veyron/services/mgmt/build/buildd: Bug fix for shell test.

The shell test would leave spawned processes lying around
(mounttabled and buildd would not be kill when the test exits).
For example, on the continuous build server there are about 40
mounttabled and buildd daemon processes spawned by previous
executions of these tests sitting idle.

The problem was the order in which the trap handlers are setup.
This current change will prevent buildd/test.sh from leaving
these useless processes around on our continuous build machine,
but the right fix (executing all registered trap handlers)
is still to be figured out.

Change-Id: I9126a1e30451bec18edfe8b1b128a89855c6b577

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref