upgrade: update vds cpu name of existing hosts to new name.

Commit 25b963 changed a certain cpu_name in the vds_option 'ServerCPUList'
to make it more consistent with other cpu names:
'Intel Haswell' -> 'Intel Haswell Family'

This commit add an update of existing clusters to the new name.

Change-Id: I89d41ac4ed0c28ec330c2db82f91bc3fcc9e2073
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1114994
Signed-off-by: Mooli Tayer <mtayer@redhat.com>