test-rofiles-fuse: skip when fusermount is not present

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

tests/test-rofiles-fuse.sh

@@ -24,6 +24,8 @@ echo "1..5"
 . $(dirname $0)/libtest.sh
 setup_test_repository "bare-user"
 
+fusermount --version >/dev/null 2>&1 || exit 77
+
 mkdir mnt
 
 $OSTREE checkout test2 checkout-test2