Convert BitBucket hook's project from a list to a string
refactor the way to get the project from the request args
added test for checking that the project is correctly extracted from the request args
added release note about bitbucket dialect
Merge pull request #1349 from sa2ajj/fix-3025

Fix BitBucket hook (backport to eight)

Fixes ticket:3025
corect the sense of the old-slave support for slaveVersionIsOlderThan