[XENAPI] Support for VBD/VIF info listing in vm-list --long

Signed-off-by: Alastair Tse <atse@xensource.com>

tools/python/scripts/README

@@ -0,0 +1,49 @@
+Xen API Test
+============
+
+xapi.py is a simple command line tool to test the functionality of a
+domain lifecycle supporting, Xen API talking version of Xend.
+
+Creating a VM is slightly more work under the Xen API. The differences
+with this and xm is:
+
+1. None of the devices are created during vm-create. You must use
+   vbd-create and vif-create to attach a new device to the VM.
+
+2. VM's that are created using vm-create will not start by
+   default. You must use vm-start to "start" the domain.
+
+3. VM's that are created using vm-create will not be removed on
+   shutdown. You must remove it using vm-delete.
+
+Example Configuration Files
+---------------------------
+
+xapi.py uses a simple python configuration file similar to xm in the
+face of the lack of any other reasonable format.
+
+All the fields are directly mapped to the arguments that are in the
+Xen API constructore for the respective classes.
+
+xapi.domcfg.py: example configuration for a paravirtualised domain.
+xapi.vbdcfg.py: example configuration for a file based block device.
+xapi.vifcfg.py: example configuration for a simple bridged network
+                device.
+
+Example Session
+---------------
+
+xapi.py vm-list
+xapi.py vm-create xapi.domcfg.py
+xapi.py vbd-create <DomainName> xapi.vbdcfg.py
+xapi.py vif-create <DomainName> xapi.vifcfg.py
+
+Notes
+-----
+
+Currently lacking:
+
+1. Any real authentication. XendAuthSessions need to be filled in with
+   a proper authentication implementation either using PAM or other
+   means.
+