Adds a new AGR_SALES SALES_AGREEMENT between the Company party and the DemoCustomer party (in the role of CUSTOMER).
This comes handy when testing sale orders agreements in order manager. Note that it changes the price of GZ-1000 product to USD$10

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1585679 13f79535-47bb-0310-9956-ffa450edef68