bsmtp bls bextract: fixes for command line parsing

[alaaeddineelamri]

Description

This PR makes sure the -h or --mailhost option is not required and can be left out. It can then be set to the SMTPSERVER environment variable, or default localhost.

• SMTPSERVER can handle fqdn:port/0.0.0.0:port/[::]:port syntaxes
• debug level -d20 show now from which source the host and port is taken.

This PR also include a small fix to handle --include-list (-i) flag in bextract and bls

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[bruno-at-bareos]

It is almost working well except if someone use the SMTPSERVER env var with a :PORT

export SMTPSERVER=smtp.domain.tld:25
bsmtp -f 'Bareos daemon<hostmaster@ioda.net>' -s "bsmtp test without env var" -c ops@domain.tld admin@domain.tld <<< "New test of bsmtp with env var and 
 option -h non required"
bsmtp: tools/bsmtp.cc:407-0 Error unknown mail host "smtp.domain.tld:25": ERR=Name or service not known
bsmtp: tools/bsmtp.cc:410-0 Retrying connection using "localhost".
bsmtp: tools/bsmtp.cc:436-0 Failed to connect to mailhost localhost

using the var without the port works.

I've done this test as if you bsmtp --help indicate this should be possible

-h,--mailhost <mailhost/IPv4_address:port>,<[mailhost/IPv6_address]:port>
    Use mailhost:port as the SMTP server.

[bruno-at-bareos]

Looks good for the moment, check my comment about the test with SMTPSERVER:PORT.

[alaaeddineelamri]

I've done this test as if you bsmtp --help indicate this should be possible

-h,--mailhost <mailhost/IPv4_address:port>,<[mailhost/IPv6_address]:port>
    Use mailhost:port as the SMTP server.

The help indicates using host:port within the options, but not as the environment variable. That could doable though, but should be documented where providing the environment variable is mentionned.

[bruno-at-bareos]

Can we check if we can better handle the default?
Also bsmtp.cc need to have copyright updated.

[bruno-at-bareos]

--removed--

[bruno-at-bareos]

Good Work, I think we can squash the commit concerning bsmtp in one and the second concerning bextract and bls

[bruno-at-bareos]

Thanks a lot!!!

Ready for merge