Handle whois errors better

[eheydrick]

Add timeout option and increase to 10 seconds - whois gem defaults to 5 seconds, which is too short for some whois servers. Also retry connection errors.

Before:

/opt/sensu/embedded/bin/check-whois-domain-expiration-multi.rb -d ... -w 30 -c 7
Check failed to run: Errno::ECONNRESET: Connection reset by peer, ["/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/server/socket_handler.rb:40:in `rescue in call'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/server/socket_handler.rb:38:in `call'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/server/adapters/base.rb:175:in `query'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/server/adapters/verisign.rb:33:in `request'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/server/adapters/base.rb:107:in `block in lookup'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/server/adapters/base.rb:143:in `buffer_start'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/server/adapters/base.rb:106:in `lookup'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/client.rb:94:in `block in lookup'", "/opt/sensu/embedded/lib/ruby/2.2.0/timeout.rb:88:in `block in timeout'", "/opt/sensu/embedded/lib/ruby/2.2.0/timeout.rb:32:in `block in catch'", "/opt/sensu/embedded/lib/ruby/2.2.0/timeout.rb:32:in `catch'", "/opt/sensu/embedded/lib/ruby/2.2.0/timeout.rb:32:in `catch'", "/opt/sensu/embedded/lib/ruby/2.2.0/timeout.rb:103:in `timeout'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois/client.rb:91:in `lookup'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/whois-3.6.3/lib/whois.rb:42:in `lookup'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/sensu-plugins-network-checks-0.1.4/bin/check-whois-domain-expiration-multi.rb:76:in `block in expiration_results'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/sensu-plugins-network-checks-0.1.4/bin/check-whois-domain-expiration-multi.rb:75:in `each'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/sensu-plugins-network-checks-0.1.4/bin/check-whois-domain-expiration-multi.rb:75:in `expiration_results'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/sensu-plugins-network-checks-0.1.4/bin/check-whois-domain-expiration-multi.rb:90:in `run'", "/opt/sensu/embedded/lib/ruby/gems/2.2.0/gems/sensu-plugin-1.2.0/lib/sensu-plugin/cli.rb:56:in `block in <class:CLI>'"]

After:

/opt/sensu/embedded/bin/check-whois-domain-expiration-multi.rb -d ... -w 30 -c 7
WhoisDomainExpirationCheck OK: No domains expire in the near term

Pull Request Checklist

Is this in reference to an existing issue?

General

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[eheydrick]

@analytically @sstarcher @mattyjones ready for review and merge