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. (merged from branch_5x r1634771, manually fixing solr/CHANGES.txt conflict)
lucene/dev/branches/lucene_solr_4_10/
lucene/dev/branches/lucene_solr_4_10/solr/CHANGES.txt