Remove the deprecated bin/post and bin/postlogs (#2282)

We have richer more capable equivalents in the bin/solr CLI tool.

Author: epugh

solr/.gitattributes

@@ -19,7 +19,6 @@
 # -nix specific
 bin/solr        text eol=lf
 bin/init.d/solr text eol=lf
-bin/post        text eol=lf
 *.bash     text eol=lf
 *.sh       text eol=lf