travis: Add workaround for a tox/virtualenv/six issue

virtualenv is installed as dependency of tox and 20.0.0 added a
dependency on a newer version of six, which is not automatically
installed/updated.

diff --git a/scripts/test.sh b/scripts/test.sh
index 87be180c9cb52fa67736598bf5f68a5b4fe68a56..3531fdb745153ffa16c3b939ed61b4a4dc91e8fa 100755 (executable)
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -157,7 +157,7 @@ all|coverage|sonarcloud)
                  libmysqlclient-dev libsqlite3-dev clearsilver-dev libfcgi-dev
                  libpcsclite-dev libpam0g-dev binutils-dev libnm-dev libgcrypt20-dev
                  libjson-c-dev iptables-dev python-pip libtspi-dev libsystemd-dev"
-       PYDEPS="tox"
+       PYDEPS="tox six>=1.12.0"
        if test "$1" = "deps"; then
                build_botan
                build_wolfssl