SASL External Support for Authentication

• Changesets:
  • Revision 00396c15 by mathieui on 2014-12-11T21:28:44Z:

Fix #2847 (SASL External support)

- Add two new options, keyfile and certfile, which must be both set for
  the auth to work.
- if both are set, then poezio doesn’t force-prompt a password if there
  is none specified
- add /cert_add, /cert_fetch, /cert_disable, /cert_revoke and /certs
  commands.
- add a page of documentation on the process