Use getrandom() for picking xid initial offset
Although this place id not cryptgraphically relevant, there is no point
in not using a proper random value: we call into krb5, which uses
getrandom() as well.
Signed-off-by: Simo Sorce <simo@redhat.com>
[rharwood@redhat.com: Rewrote commit message]
Reviewed-by: Robbie Harwood <rharwood@redhat.com>
Merges: #255