Merge "Override install_command in neutron unit tests for periodic queue"

jenkins/scripts/run-tox-with-neutron-lib-master.sh

@@ -21,6 +21,7 @@ cat << EOF >> tox.ini
 setenv = VIRTUAL_ENV={envdir}
 passenv = TRACE_FAILONLY GENERATE_HASHES http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 usedevelop = True
+install_command = pip install {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 whitelist_externals = sh