dlm: clear out addrs before calling into corosync_cft_get_node_addrs()
    
    The corosync_cfg_get_node_addrs() call does not fill the whole of the
    addrs field passed in, specifically it only writes the the address
    family and IP address, leaving the port number untouched.
    
    If the port number contains junk, then that can get passed into the
    kernel by dlm_controld where it is subsequently used in the comparison
    that checks for valid cluster nodes in a connection. If this happens
    then an otherwise valid connection can be rejected and the dlm will
    hang.
    
    I've seen this quite often on s390 but I don't see any reason why it
    might not also be causing intermittent connection problems on other
    archs.
    
    Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>