better expose default creds for devs

CHANGELOG.rst

@@ -15,6 +15,10 @@ Added
   group in st2.conf. (new feature) #4914
 
   This option was requested by Harry Lee (@tclh123) and contributed by Marcel Weinberg (@winem).
+* Added a FAQ for the default user/pass for the `tools/launch_dev.sh` script and print out the
+  default pass to screen when the script completes.
+
+Contributed by @punkrokk
 
 Changed
 ~~~~~~~

dev_docs/Troubleshooting_Guide.rst

@@ -1,6 +1,12 @@
 Troubleshooting Guide
 =====================
 
+**Q: What is the default username and password for the** ``tools/launchdev.sh`` **script?**
+
+**A: The default creds are**:
+  user: testu
+  pass: testp
+
 **Q: After starting st2 server using** ``tools/launchdev.sh`` **script, getting following error:**::
 
   $ st2 action list

tools/launchdev.sh

@@ -436,6 +436,9 @@ function st2start(){
         fi
     fi
 
+    # Print default creds to the screen
+    echo "The default creds are testu:testp"
+
     # List screen sessions
     screen -ls || exit 0
 }