tooling in ep-engine lack support for authentication with a user

It is not possible to specify the username to use for authentication in cbstats or cbepctl (and most likely all of the tools).

Nor does it seem possible to tell it to use SSL and it fails if an IPv6 address is being used.

And it needs to enable xerror support in order to get the full error messages from the server instead of having the server mask out new error codes (==> silent disconnect in most cases)

All of the "mctools" use the following options:

-4 - Use IPv4

-6 - Use IPv6

-h host[:port] - An IPv6 address with port is written as [addr]:port (if not specified host == localhost)

-p port - Use this port. If not specified == 11210

-u user - the user to use for authentication

-P password - The password to use (currently you can't specify '-' and read from stdin)

-b bucket - The bucket to operate on

-s  - Use SSL

We should also extend that to allow to specify the SASL mechanism to use (by default it picks the most secure offered by the server).