Bug#859243: please include tmpfiles.d snippet for OTP rundir

[Sam Hartman]

my initial reaction is that it seems like freeipa should stick freeipa
sockets in  /run/freeipa not /run/krb5kdc.
However, it looks like the OTP plugin in the MIT code looks at this
patch although it doesn't create a socket there.
Note to myself for when I look at this bug after stretch release.