SOLR-6655: SimplePostTool now features -Dhost, -Dport, and -Dc (for core/collection) parameters

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1634767 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6661: Adjust all example configurations to allow overriding error-prone relative paths for solrconfig.xml <lib> references with solr.install.dir system property; bin/solr scripts will set it appropriately.

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commit merge info diff

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1634772 13f79535-47bb-0310-9956-ffa450edef68
commit merge info diff

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1634773 13f79535-47bb-0310-9956-ffa450edef68