handler_test: make test more reliable
handler_test: make test more reliable

Linux gives "text/x-sh", and not "application/x-sh".

tsuru/gandalf,marcelometal/gandalf,flaviamissi/gandalf,gleez/gandalf,marcelometal/gandalf,scorphus/gandalf,tsuru/gandalf,gleez/gandalf,marcelometal/gandalf,gleez/gandalf,scorphus/gandalf,flaviamissi/gandalf