SOLR-6543: Give HttpSolrServer the ability to send PUT requests

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1627464 13f79535-47bb-0310-9956-ffa450edef68
Merged revision(s) 1627467 from lucene/dev/trunk:
Remove obsolete string

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1627468 13f79535-47bb-0310-9956-ffa450edef68