Improve docs for running IPA in Devstack

Documented what the settings are in the localrc, as well as adding the
credentials for swift so when your localrc is setup as documented,
devstack runs without prompting.

Change-Id: Ie965a6c3b4f97b14e97e78e8cf77c789a891a387

doc/source/dev/dev-quickstart.rst

@@ -312,12 +312,25 @@ or the agent driver, not both.::
 If running with the agent driver::
 
     cat >>localrc <<END
-    enable_service s-proxy s-object s-container s-account
+    # Agent driver requires swift with tempurls
+    # Enable swift services
+    enable_service s-proxy
+    enable_service s-object
+    enable_service s-container
+    enable_service s-account
+
+    # Enable tempurls and set credentials
+    SWIFT_HASH=password
+    SWIFT_TEMPURL_KEY=password
     SWIFT_ENABLE_TEMPURLS=True
+
+    # Enable agent driver
     IRONIC_ENABLED_DRIVERS=fake,agent_ssh,agent_ipmitool
-    IRONIC_BUILD_DEPLOY_RAMDISK=False
     IRONIC_DEPLOY_DRIVER=agent_ssh
 
+    # To build your own IPA ramdisk from source, set this to True
+    IRONIC_BUILD_DEPLOY_RAMDISK=False
+
     END
 
 Run stack.sh::