Add procedure for updating aims SA password

The password of the account "Aims Service (aims)" will expire in 30 day(s).

Used for LDAP and LANDB requests.

docs/aims2/aims2.md

@@ -48,6 +48,11 @@ All images are backed up into the DB as blobs, so they are not only stored in Ce
 * Owner: Alex Iribarren
 * Purpose: connecting to LANDB and LDAP
 
+**Password changing procedure:**
+* Annouce with an OTG that the service will be degraded for 5-10min. No new issued installations will work.
+* Update the service account password and update the Teigi stored value: `tbag set --hg aims aims_password --binary <new_password>`
+* Force a Puppet run on each of the AIMS hosts and run `service httpd restart`
+
 ---
 
 * User: `linux_private`