parse debian/tests/control for test dependencies

Our integration tests need some additional dependencies to run and
function correctly, but while multiple places run them, there is no need
to also specify the these dependencies in multiple places.

Git-Dch: Ignore

.travis.yml

@@ -2,5 +2,4 @@ language: cpp
 before_install:
  - sudo apt-get update -q
  - sudo ./prepare-release travis-ci
- - sudo apt-get install -q --no-install-recommends stunnel4 db-util
 script: make && make test && test/integration/run-tests

prepare-release

@@ -105,6 +105,7 @@ elif [ "$1" = 'buildlog' ]; then
 	done
 elif [ "$1" = 'travis-ci' ]; then
 	apt-get install -q --no-install-recommends $(sed -n -e '/^Build-Depends: /,/^Build-Depends-Indep: / {p}' debian/control | sed -e 's#([^)]*)##g' -e 's#^Build-Depends\(-Indep\)\?: ##' | tr -d ',')
+	apt-get install -q --no-install-recommends $(sed -n 's#^Depends: .*@, \(.*\)$#\1#p' debian/tests/control | tr -d ',')
 else
 	echo >&1 "Usage:\t$0 pre-export
 \t$0 post-build