libnet-openssh-perl: new dependency

[Alexandr Savca]

Hi all,

Seems like libnet-openssh-perl requires libio-pty-perl.

backtrace example:

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Uncaught exception from user code:
	unable to load Perl module IO::Pty: Can't locate IO/Pty.pm in
@INC (you may need to install the IO::Pty module) (@INC contains:
~/perl/lib/perl5 ~/perl/lib/perl5/x86_64-linux /etc/perl
/usr/local/lib/x86_64-linux-gnu/perl/5.28.1
/usr/local/share/perl/5.28.1 /usr/lib/x86_64-linux-gnu/perl5/5.28
/usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.28
/usr/share/perl/5.28 /usr/local/lib/site_perl /usr/lib/x86_64-linux-
gnu/perl-base .) at (eval 22) line 1.
	 at /usr/share/perl5/Net/OpenSSH.pm line 948.
	Net::OpenSSH::ModuleLoader::_load_module("IO::Pty") called at
/usr/share/perl5/Net/OpenSSH.pm line 948

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Best Regards,
Alexandr Savca