packer.py version

0.3.0

Expected behavior

Hidden password

Actual behavior

When you run p.build command with the password argument, everyone can see the password in the process status through the build.

root 1987637 0.4 0.8 851920 68344 pts/1 Sl+ 09:43 0:00 /usr/sbin/packer build -var VC_SERVER=vc-server.com -var VC_USERNAME=username -var VC_PASSWORD=visible_password