Modernize Solr package creation includes/excludes: client/** are gone; and README.committers.txt has moved from lib/ to licenses/. (merged trunk r1531705)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1531709 13f79535-47bb-0310-9956-ffa450edef68