Allow copy of dead symbolic links, see https://dev.cfengine.com/issues/6175
Implemented all suggestions from @ediosyncratic. Thanks for the review
obey coding style and changed log message
the detection of dead symbolic links must also be ported to protocol_version 2 to my surprise
Merge pull request #1892 from basvandervlies/cf_serverd_allow_copy_of_dead_symbolic_links

Allow copy of dead symbolic links