Swap to a shared saslauthd mount when Postfix is moved to Dovecot

[shtlrs]

We currently have a hack in place to have both jitsi and postfix work with the same saslauth config

infra/ansible/roles/jitsi/tasks/ldap_auth.yml

Lines 63 to 70 in aea5fdb

	- name: Create Cyrus SASL Configuration file
	copy:
	dest: /etc/sasl/prosody.conf
	content: |
	pwcheck_method: saslauthd
	mech_list: PLAIN
	saslauthd_path: /var/spool/postfix/var/run/saslauthd/mux
	tags:

We should swap to a shared mount when Postfix is moved to Dovecot.

[jchristgit]

Postfix has been moved to Dovecot.
We are ready.