Revert "[joyent|compute] make password required" This reverts commit 6e93321e29e69cc863aa9d78cdcf1c83203a2fa7.
Revert "[joyent|compute] make password required"
This reverts commit 6e93321e29e69cc863aa9d78cdcf1c83203a2fa7.

The reason for reverting this is Joyent's CloudAPI allows authenticating using
either a username/password credential pair OR using a username and SSH private key.

In http-signature authentication scheme, no password is used.

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