BUG: Remove creating motech user from web-security build process.

https://trello.com/c/wF5PQdfd

Each module that needs motech user for IT should create the user before IT
and deletes the websecurity db after IT. Verboice Bundle IT requires motech
user. So, added the pre and post IT goals.

Change-Id: I06a1e40f52899b3f1e5838f5daafe6a9961d8ccf