tests: fix socket-test to not depend on locale
tests: fix socket-test to not depend on locale

https://bugzilla.gnome.org/show_bug.cgi?id=749397

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