upgrade

Imports

• golang.org/x/net/context
• github.com/vmware/vic/lib/install/validate
• github.com/urfave/cli
• github.com/vmware/vic/pkg/vsphere/vm
• github.com/vmware/vic/lib/install/management
• github.com/vmware/vic/lib/install/data
• github.com/Sirupsen/logrus
• github.com/vmware/vic/pkg/errors
• github.com/vmware/vic/pkg/trace

Standard library imports

• path
• time