tests/9pfs: Factor out do_attach() helper

fs_attach() is a top level test function. Factor out the reusable
code to a separate helper instead of hijacking it in other tests.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160321017450.266767.17377192504263871186.stgit@bahia.lan>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
1 file changed