check_smtp.c: modified SSL check for use with -e (#1379)

[Oliver Skibbe]

currently STARTTLS check does not work with -e if there's text like '220
hostname ESMTP*'. This is caused by SMTP answer from host. 

Postfix answer: 220 2.0.0 Ready to start TLS
Exchange 2010: 220 2.0.0 SMTP server ready

This fix checks against 220 and closes #1093
You can view, comment on, or merge this pull request online at:

  https://github.com/monitoring-plugins/monitoring-plugins/pull/1379

-- Commit Summary --

  * check_smtp.c: modified SSL check for use with -e

-- File Changes --

    M plugins/check_smtp.c (2)

-- Patch Links --

https://github.com/monitoring-plugins/monitoring-plugins/pull/1379.patch
https://github.com/monitoring-plugins/monitoring-plugins/pull/1379.diff

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https://github.com/monitoring-plugins/monitoring-plugins/pull/1379
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