SOLR-6899: Make CollectionAdminRequest.action setter protected instead of public (merge from trunk)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1648452 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6779: much /browse cleanup, merged from trunk r1648028, r1648030, and r1648031

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1648459 13f79535-47bb-0310-9956-ffa450edef68
Fix mis-merged CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1648462 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6779: remove directory that should have been removed with previous merge

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1648464 13f79535-47bb-0310-9956-ffa450edef68
Update logo/style in generic templates (merged from r1648467)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1648468 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6435: Added bin/post

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1648479 13f79535-47bb-0310-9956-ffa450edef68