tests/legacy/p_dovecot check nc for need option
requested to merge almalinux/compose-tests:tests-legacy-p_dovecot-check-nc-for-need-option into main
dovecot_imap_login.sh, dovecot_pop3_login.sh: check nc for '--delay' option
dovecot_imap_login.sh, dovecot_pop3_login.sh: check nc for '--delay' option