Add second ldap image without demo data (#150)

* have a separate ldap container for demo data
* add question to setup.sh about demo users
* make ldap container switchable
* piggyback small fixup for search failing when starting directly after kopano-server

fixes #53

ldap/bootstrap/ldif/optimize-index.ldif

@@ -0,0 +1,20 @@
+dn: olcDatabase={1}mdb,cn=config
+changetype: modify
+replace: olcDbIndex
+olcDbIndex: memberOf eq
+olcDbIndex: entryCSN eq
+olcDbIndex: entryUUID eq
+olcDbIndex: objectClass eq
+olcDbIndex: cn pres,eq,sub
+olcDbIndex: gidNumber eq
+olcDbIndex: mail pres,eq,sub
+olcDbIndex: memberUid eq
+olcDbIndex: ou eq
+olcDbIndex: uid eq
+olcDbIndex: uidNumber eq
+olcDbIndex: uniqueMember eq
+olcDbIndex: kopanoAccount eq,pres
+olcDbIndex: kopanoAliases eq
+olcDbIndex: kopanoViewPrivilege eq
+olcDbIndex: sn pres,eq,sub
+olcDbIndex: givenName pres,eq,sub