Fix TravisCI removal of installed OpenXPKI files from cache
Fix TravisCI removal of installed OpenXPKI files from cache

oliwel/openxpki,stefanomarty/openxpki,stefanomarty/openxpki,openxpki/openxpki,oliwel/openxpki,oliwel/openxpki,oliwel/openxpki,oliwel/openxpki,stefanomarty/openxpki,openxpki/openxpki,stefanomarty/openxpki,stefanomarty/openxpki,openxpki/openxpki,stefanomarty/openxpki,oliwel/openxpki,openxpki/openxpki