travis: Install dependencies for each test dynamically

Since the installation of all packages alone takes several minutes this
should speed up some test cases.

.travis.yml

@@ -7,15 +7,7 @@ compiler:
 before_install:
   - sudo apt-get update -qq
   - sudo apt-get install -qq bison flex gperf gettext
-  # TODO: modularize this to speed up builds (e.g. call 'test.sh deps' to do this for the current TEST)
-  - sudo apt-get install -qq libgmp-dev libssl-dev libgcrypt11-dev
-  - sudo apt-get install -qq libcurl4-gnutls-dev libsoup2.4-dev
-  - sudo apt-get install -qq libunbound-dev libldns-dev
-  - sudo apt-get install -qq libmysqlclient-dev libsqlite3-dev
-  - sudo apt-get install -qq clearsilver-dev libfcgi-dev
-  - sudo apt-get install -qq libnm-glib-dev libnm-glib-vpn-dev
-  - sudo apt-get install -qq libpcsclite-dev libpam0g-dev
-  - sudo apt-get install -qq binutils-dev libunwind7-dev
+  - ./scripts/test.sh deps
 
 script:
   - ./autogen.sh