test/travis_before_linux.sh: remove bash -e flag
To allow a proper fail/retry, -e needs to be removed.
Ideally this shouldn't happen, so I'd consider this
a test to see if the bash for workaround is a viable
option or not.
-#!/bin/bash -ex
+#!/bin/bash -x
if ! test -v SKIP_TESTING; then
# Use a rudimental retry workflow as workaround to svn export hanging for minutes.
# Travis automatically kills a build if one step takes more than 10 minutes without
