Update net-ssh to 3.0.1

Since its a major version update, we need to check all its reverse dependencies still work with new version.

Reverse Depends:

• ruby-net-scp
• vagrant
• serverspec-runner
• ruby-sshkit
• ruby-specinfra
• ruby-net-ssh-multi
• ruby-net-ssh-gateway
• ruby-net-sftp
• ruby-net-scp
• ruby-fog-core
• rhc
• chef