test/ssl: cover case when we writing to be_openssl after connecting Right now it fails because of regression for filtered openssl bufferevent, and by it I mean ssl/bufferevent_filter_write_after_connect test, and by fails - hang. Regression-for: da52933550fd4736aa1c213b6de497e2ffc31e34 ("be_openssl: don't call do_write() directly from outbuf_cb")