This adds the ability for a pool.label to override the
pool.host-key-checking value, while having a label exist in the same
pool. This is helpful because it is possible for 1 pool to mix network
configuration, and some nodes maybe missing a default gateway (making
them unroutable by default).
Change-Id: I934d42b8e48aedb0ebc03137b7305eb2af390fc7
Signed-off-by: Paul Belanger <pabelanger@redhat.com>