Deb/rpm: change test user password to "foobar"

kasmvncpasswd validates password, so "bar" would be too short.

builder/test-deb-barebones

@@ -11,4 +11,5 @@ docker build --build-arg KASMVNC_PACKAGE_DIR="build/${os_codename}" \
   -f dockerfile.${os}_${os_codename}.barebones.deb.test .
 echo
 echo "You will be asked to set password. User name is docker."
-docker run -it -p 443:8443 --rm kasmvnctester_barebones_${os}:$os_codename
+docker run -it -p 443:8443 --rm -e "VNC_USER=foo" -e "VNC_PW=foobar" \
+  kasmvnctester_barebones_${os}:$os_codename