Fix .rex_getaddrinfo inconsistencies

[zeroSteiner]

The .rex_getaddrinfo method behaves inconsistently with Addrinfo.getaddrinfo, which makes .getaddresses inconsistent depending on if a resolver is present or not. When no resolver is present, a numeric address (either decimal or hex, not binary or octal) is specified, it's converted to an IPv4 address:

[2] pry(#<Msf::Modules::Exploit__Multi__Ssh__Sshexec::MetasploitModule>)> ::Addrinfo.getaddrinfo('0', 0, ::Socket::AF_UNSPEC, ::Socket::SOCK_STREAM)
=> [#<Addrinfo: 0.0.0.0 TCP (0)>]

But when a resolver is present, .getaddresses will call .rex_getaddrinfo and it falls with a resolution error because the address is not a valid hostname:

[10] pry(#<Msf::Modules::Exploit__Multi__Ssh__Sshexec::MetasploitModule>)> Rex::Socket.rex_getaddrinfo('0')
SocketError: getaddrinfo: Name or service not known
from /home/smcintyre/.rvm/gems/ruby-3.1.5@metasploit-framework/gems/rex-socket-0.1.57/lib/rex/socket.rb:996:in `rex_resolve_hostname'
[11] pry(#<Msf::Modules::Exploit__Multi__Ssh__Sshexec::MetasploitModule>)>

This came up as an issue that prevents Metasploit's route command from working when invoked as route add 0 0 -1 to add a default route for all IPv4 addresses through the most recent session when the DNS feature is enabled. This also removes references to ::Net::DNS in favor of using the constants from Dnsruby::Types instead, which was already referenced but not defined as a requirement. Adding Dnsruby as a requirement was needed to make the tests work.

[adfoster-r7]

Rebasing on master should fix the hanging builds, fixed by #68

[zeroSteiner]

I just noticed that Addrinfo.getaddrinfo also handles normal IP addresses. I should really add that here as well. Let me get to that today to fix that inconsistency too.

[3] pry(#<Msf::Framework>)> hostname='127.0.0.1'
=> "127.0.0.1"
[4] pry(#<Msf::Framework>)> ::Addrinfo.getaddrinfo(hostname, 0, ::Socket::AF_UNSPEC, ::Socket::SOCK_STREAM)
=> [#<Addrinfo: 127.0.0.1 TCP>]
[5] pry(#<Msf::Framework>)> ::Addrinfo.getaddrinfo('::1', 0, ::Socket::AF_UNSPEC, ::Socket::SOCK_STREAM)
=> [#<Addrinfo: ::1 TCP>]
[6] pry(#<Msf::Framework>)> 

[zeroSteiner]

Alright this should be ready to go now. I added normal IP address support in the last commit along with tests for it.