config: Don't free pointers used by transports

reload failed for UDP[U] because they had saved pointers
to the interfaces[] array. so memcpy into that rather then
re-allocate it.

Also, move the check for different IP address families so
it also gets run at reload time.

Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>