passwords starting with a dash are not supported

[jsievers]

What version of the credhub server you are using?

Server Version: 2.12.6

What version of the credhub cli you are using?

CLI Version: 2.9.3

If you were attempting to accomplish a task, what was it you were attempting to do?

set a password whose value is predetermined and starts with a dash (-)

What did you expect to happen?

password should be set

What was the actual behavior?

$ credhub set -t password -n '/example-password' -w '-supersecret'
expected argument for flag `-w, --password', but got option `-supersecret'

Please confirm where necessary:

• [x] I have included a log output
• [x] My log includes an error message
• [x] I have included steps for reproduction

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