[DS-1460] Add a new file for Solr messages to the log4j configuration
After discussion, raise loglevel and set a default limit on number of logs retained.
Merge pull request #268 from mwoodiupui/DS-1460

[DS-1460] Add SOLR logging config file
This merely adds a log4j appender for Solr's logging which will be used by the next release of dspace-solr.
DS-1586 Fix SLF4J and JCL Bridge version incompatibility: move up to dspace-parent POM
DS-1616 Localhost is not longer supported as a valid URL Solr

Replaced the deprecated org.apache.commons.validator.UrlValidator with the new
version from apache import org.apache.commons.validator.routines.UrlValidator
enabling local urls (localhost and internal names like mymachine, etc.)
Merge pull request #269 from abollini/DS-1586

DS-1586 Fix SLF4J and JCL Bridge version incompatibility
Merge pull request #271 from abollini/DS-1616

DS-1616 Localhost is not longer supported as a valid Solr server URL
DS-1611 Enable Discovery By Default in JSPUI
Merge pull request #272 from abollini/DS-1611

DS-1611 Enable Discovery By Default in JSPUI