During KNIME startup warnings in console

[sverhoeven]

The following warnings appear when Silicos-IT nodes have been installed and KNIME is started.

WARN  Create File Name     1:19:9     Selected directory '/tmp/knime_tc_kdzmifsggaxl' cannot be accessed!
WARN  Create File Name     1:20:9     Selected directory '/tmp/knime_tc_cba8td5eh8qk' cannot be accessed!
WARN  Create File Name     1:21:9     Selected directory '/tmp/knime_tc_injduzca7lcy' cannot be accessed!
WARN  Create File Name     1:22:9     Selected directory '/tmp/knime_tc_mcswy39tyhje' cannot be accessed!
WARN  Create File Name     1:24:9     Selected directory '/tmp/knime_tc_lc1km4mja5qp' cannot be accessed!
WARN  Create File Name     1:25:9     Selected directory '/tmp/knime_tc_mlnwtqlewpqa' cannot be accessed!

The directories have a different random string each startup.

[sverhoeven]

In 6086ae1 made dragging a silicos-it metanode to workflow no longer print a warning, but the startup warn message is still there.