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requesttracker: use test db if on jessie

Description

requesttracker: use test db if on jessie

If on jessie, use the test db server to test
upgrading without touching current prod server.

Also, include standard in test role to avoid icinga config issue.

Bug:T119112
Change-Id: I8fc4f873e6bd3ab1364e9925ee3dfa88a8dfa491