xenserver: Include ovs-bugtool in xenserver rpm.

xenserver: Include ovs-bugtool in xenserver rpm.

Currently we do not include ovs-bugtool in xenserver rpms.
This is because xen-bugtool provides the information required
to debug openvswitch. But xen-bugtool also provides a lot more
data that is not required for openvswitch debugging. This makes
the debug bundle quite huge.

Also, xen-bugtool takes a lot of time to collect the required
information.  For example, in my xenserver6.0.2 with 100 OVS
interfaces, 'xen-bugtool -y -s' takes 180 seconds to finish
creating a debug bundle with a size of 124M.

On the other hand, if we run a ovs-bugtool command of the form
'ovs-bugtool -y -s --log-days=10 --outfile bundle.tar.gz', it
takes 5 seconds to finish with a debug bundle size of 28M.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>