Fix tcp starttls test for smtp

[dragoangel]

When SMTP capability listed as last option it described by " " (space), in nginx smtp proxy with starttls offloading it's common that starttls placed in last sequence, resulting in faled tests from ssl_exporter aka:

220 my-smtp-server ESMTP ready
EHLO prober
250-my-smtp-server
250-SIZE 55000000
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-SMTPUTF8
250-CHUNKING
250-AUTH PLAIN LOGIN
250 STARTTLS

This PR should fix such cases

[dragoangel]

@ribbybibby as I understand your code support regex there and should work like a charm, right?

[ribbybibby]

@dragoangel Thanks for the PR! Could you please update the tests to check this works?

[dragoangel]

@dragoangel Thanks for the PR! Could you please update the tests to check this works?

Will check ✅🙂

[dragoangel]

@ribbybibby can you please check? Hope it okay :D

[dragoangel]

@ribbybibby can you please issue a release? :) Would like to pull image with this changes 🙏

[dragoangel]

@ribbybibby can you please issue a release? :) Would like to pull image with this changes 🙏

@ribbybibby sorry for pinging, but can you please create release with this changes?

[ribbybibby]

@dragoangel v2.4.3 has been released

[dragoangel]

@dragoangel v2.4.3 has been released

Thank you