tests: fix a sporadic hang in connection-test
tests: fix a sporadic hang in connection-test

https://bugzilla.gnome.org/show_bug.cgi?id=744666

jwendell/libsoup,jwendell/libsoup,fanc999/libsoup,fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,fanc999/libsoup,jwendell/libsoup,fanc999/libsoup,jwendell/libsoup