multiple fixes in check_smtp from debian (bts #285554):

- fix for double free via SSL_CTX_free.  looks like the previous author
  knew this was a problem but didn't care enough to fix it ;p.
- use defines instead of const chars for SMTP strings.
- default to send our fqdn (via gethostbyname lookup on gethostname)
  in the HELO string, as this is an RFC/SMTP requirement.  overridable
  via cmdline.
- use EHLO instead of HELO if using STARTTLS, as it is not SMTP but
  ESMTP.
- verify the server supports STARTTLS before initializing it.
- always send QUIT before disconnecting when possible.


git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1246 f882894a-f735-0410-b71e-b25c423dba1c

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