Add a note on randomly generated service passwords by the installer

script.

Author: Kami

docs/source/install/__installer_passwords.rst

@@ -0,0 +1,8 @@
+.. note::
+
+  For security reasons, installer script enables authentication and generates random passwords
+  for dependent services such as MongoDB and PostgreSQL.
+
+  If for some reason (e.g. debugging), you need to access those services directly you can find
+  passwords in the config files - ``/etc/st2/st2.conf`` for MongoDB and RabbitMQ password and
+  ``/etc/mistral/mistral.conf`` for PostgreSQL password.

docs/source/install/index.rst

@@ -42,6 +42,8 @@ Once it completes successfully, you will see the following output:
   Thanks for installing StackStorm! Come visit us in our Slack Channel
   and tell us how it's going. We'd love to hear from you!
 
+.. include:: __installer_passwords.rst
+
 .. rubric:: Installations
 
 .. toctree::
@@ -55,4 +57,3 @@ Once it completes successfully, you will see the following output:
     Brocade Workflow Composer <bwc>
     config/index
     upgrades
-