veyron/tools/mgmt/test.sh: fix integration test on jenkins
veyron/tools/mgmt/test.sh: fix integration test on jenkins

Jenkins runs on GCE. The address published by default is not reachable for
internal clients. Hardcode it to localhost instead.

Change-Id: I6326bbb66c838b1c47da7019c611de5a3d957334

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