SOLR-6476 refactored bulk schema APIs and other read REST APIs to use standard RequestHandler mechanism

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642862 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6796: distrib.singlePass does not return correct set of fields for multi-fl-parameter requests

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642874 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4792: Remove WAR file from dist directory.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642880 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-6087: allow custom DirectoryReader to SearcherManager

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642891 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6732: back compat support needed in trunk and 5x to support upgrades from 4.10.1 to 5x

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642920 13f79535-47bb-0310-9956-ffa450edef68