Indent ACLs

Change-Id: I9d2968ef39ee62d5ba6db0fe73e8f88e480b705f
Add comments to explain the routers' functions

Change-Id: Iaf628a6f321c3a02841b275b2f7b5002303268f7
Formatting of some options for improved readability

Change-Id: I4f6771c05ebb2386b0e1e8fdb1e64b072749670e
Use local_parts router option instead of a condition

Change-Id: Id7145b25d4c9d8388482113f1c9956670a2e0d15
Use Exim's macro facility to define INSTANCEPROJECT and MAILDOMAIN

Rather than mixing both Exim's and ERB's quoting rules etc, let's
use Exim's macro rules consistently.

Also added comments to better indicate the Exim config sections.

Change-Id: I81191b6f19551aa26e89bf18c491ab48facf2c97
Tool Labs: fix mail to bind to LDAP and not use -x

Those lookups used to work with anonymous binds, but they no
longer do since the LDAP migration.  This fixes the script to
use the credentials in /etc/ldap.conf

Change-Id: Ie584fe25197acef2226751149c2a1c552ec771c2
Merge "Tool Labs: fix mail to bind to LDAP and not use -x" into production