Remove tpool stub in xenapi tests
Remove tpool stub in xenapi tests

XenAPI stopped using tpool in commit a3a5f23487e9ca4257551fd3d430d8ebcfca131a
so remove the stubs that are unnecessary now

Change-Id: I709a1b557576471d3b69c2a28f00d25602ed090f

n0ano/ganttclient