travis: install a recent libzmq and pyzmq for tests

.travis.yml

@@ -33,11 +33,11 @@ matrix:
     - compiler: ": Win32"
       env: HOST=i686-w64-mingw32 PPA="ppa:ubuntu-wine/ppa" PACKAGES="nsis gcc-mingw-w64-i686 g++-mingw-w64-i686 binutils-mingw-w64-i686 mingw-w64-dev wine1.7 bc" RUN_TESTS=true GOAL="deploy" BITCOIN_CONFIG="--enable-gui --enable-reduce-exports" MAKEJOBS="-j2"
     - compiler: ": 32-bit + dash"
-      env: HOST=i686-pc-linux-gnu PACKAGES="g++-multilib bc python-zmq" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++" USE_SHELL="/bin/dash"
+      env: HOST=i686-pc-linux-gnu PACKAGES="g++-multilib bc python-zmq" PPA="ppa:chris-lea/zeromq" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++" USE_SHELL="/bin/dash"
     - compiler: ": Win64"
       env: HOST=x86_64-w64-mingw32 PPA="ppa:ubuntu-wine/ppa" PACKAGES="nsis gcc-mingw-w64-x86-64 g++-mingw-w64-x86-64 binutils-mingw-w64-x86-64 mingw-w64-dev wine1.7 bc" RUN_TESTS=true GOAL="deploy" BITCOIN_CONFIG="--enable-gui --enable-reduce-exports" MAKEJOBS="-j2"
     - compiler: ": bitcoind"
-      env: HOST=x86_64-unknown-linux-gnu PACKAGES="bc python-zmq" DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports CPPFLAGS=-DDEBUG_LOCKORDER"
+      env: HOST=x86_64-unknown-linux-gnu PACKAGES="bc python-zmq" PPA="ppa:chris-lea/zeromq" DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports CPPFLAGS=-DDEBUG_LOCKORDER"
     - compiler: ": No wallet"
       env: HOST=x86_64-unknown-linux-gnu DEP_OPTS="NO_WALLET=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat --enable-reduce-exports"
     - compiler: ": Cross-Mac"
@@ -45,9 +45,9 @@ matrix:
   exclude:
     - compiler: gcc
 install:
+    - if [ -n "$PACKAGES" ]; then sudo rm -f /etc/apt/sources.list.d/travis_ci_zeromq3-source.list; fi
     - if [ -n "$PPA" ]; then travis_retry sudo add-apt-repository "$PPA" -y; fi
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get update; fi
-    - if [ -n "$PACKAGES" ]; then travis_retry sudo rm -f /etc/apt/sources.list.d/travis_ci_zeromq3-source.list; fi
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get install --no-install-recommends --no-upgrade -qq $PACKAGES; fi
 before_script:
     - unset CC; unset CXX

qa/rpc-tests/zmq_test.py

@@ -39,8 +39,6 @@ class ZMQTest (BitcoinTestFramework):
             []
             ])
 
-        return nodes
-
     def run_test(self):
         self.sync_all()