Customer always has a JID

Merge branch 'create-reset-sip-account'

* create-reset-sip-account:
  Create or reset SIP account
  Factor out Catapult connection

Create or reset SIP account

New command to create or reset SIP account.  Always try create first because
it's faster and more common, fall back to search the list for our account if
that fails due to conflict.  Password is always randomly generated from the
mnemonicode word list.