CA-160911: Revert to using a less smart way to determine the current host
CA-160911: Revert to using a less smart way to determine the current host

As the following does not return the host currently running on when handling
a XAPI plugin calls from a different host:
    session.xenapi.session.get_this_host(session.handle)

This effectively backs out the following commit:
    72e5e2f7f6d20113861937f5dd834341508a66da

Signed-off-by: Robert Breker <bfcd7039ca4b92386f0756a1d5e67ea4ff23cfe0@citrix.com>

robertbreker/xscontainer,xenserver/xscontainer,xenserver/xscontainer,robertbreker/xscontainer,olivierlambert/xscontainer,olivierlambert/xscontainer