MwLinksUpdateWithSQLStoreDBIntegrationTest to show how to use LinksUpdate

Claims [1] were made that the LinksUpdate would no longer work with
SMW 1.9 well the test proves otherwise.

If one executes LinksUpdate manually together with an inappropriate use
of parse/revision/parseroutput then of course "doUpdate" will override
existing data but as the tests shows when used in suffucient manner, data
from different revisions are updated correctly and show the expected
behaviour.

This is not a Mock test, it runs on the Store and database.

[1] http://wikimedia.7.x6.nabble.com/SMW-no-longer-works-with-a-manual-LinksUpdate-call-td5020561.html

Change-Id: Icd9a925b44e62f06e472545b16ec8f71b941556b