Allow setting the number of workers to be used.

Environments with large numbers of CPUs will create a large
number of workers which can have an unnecessarily large
impact on memory usage, particular where you know how many
workers are needed.

Change-Id: Ie4bb075310a61a0873c9e56e4974600dbb4794a1
diff --git a/stackrc b/stackrc
index e071132..b786288 100644
--- a/stackrc
+++ b/stackrc
@@ -505,6 +505,11 @@
 # Allow the use of an alternate protocol (such as https) for service endpoints
 SERVICE_PROTOCOL=${SERVICE_PROTOCOL:-http}
 
+# Sets the maximum number of workers for various services and can restrict
+# the memory used where there are a large number of CPUs present
+# (the default number of workers for many services is the number of CPUs)
+# API_WORKERS=4
+
 # Local variables:
 # mode: shell-script
 # End: