tools: Remove the vtpm process model

Remove the old vtpm process model. It doesn't work very
well and is no longer supported.

Signed-off-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

tools/examples/xmexample2

@@ -136,20 +136,6 @@ disk = [ 'phy:sda%d,sda1,w' % (7+vmid),
 # Empty password disables authentication.  Defaults to the vncpasswd
 # configured in xend-config.sxp.
 
-#----------------------------------------------------------------------------
-# Define to which TPM instance the user domain should communicate.
-# The vtpm entry is of the form 'instance=INSTANCE,backend=DOM'
-# where INSTANCE indicates the instance number of the TPM the VM
-# should be talking to and DOM provides the domain where the backend
-# is located.
-# Note that no two virtual machines should try to connect to the same
-# TPM instance. The handling of all TPM instances does require
-# some management effort in so far that VM configration files (and thus
-# a VM) should be associated with a TPM instance throughout the lifetime
-# of the VM / VM configuration file. The instance number must be
-# greater or equal to 1.
-#vtpm = ['instance=%d,backend=0' % (vmid) ]
-
 #----------------------------------------------------------------------------
 # Set the kernel command line for the new domain.
 # You only need to define the IP parameters and hostname if the domain's