QueryParser should have a setDateFormat(DateFormat) method [LUCENE-1361]

Currently the only way to change the date format used by QueryParser.java is to override the getRangeQuery method. This seems a bit excessive to me. Since QueryParser isn't threadsafe (like DateFormat) I would suggest that a DateFormat field be introduced (protected DateFormat dateFormat) and a setter be introduced (public void setDateFormat(DateFormat format)) so that it's easier to customize the date format in queries. If there are good reasons against this (can't imagine, but who knows) why not introduce a protected 'DateFormat:createDateFormat())' method so that, again, it's easier for clients to override this logic.

---
Migrated from [LUCENE-1361](https://issues.apache.org/jira/browse/LUCENE-1361) by ocean, updated May 09 2016

Start with QueryParser.java and its getRangeQuery method to understand how date formats are currently selected and used. The work is done when callers can customize the query date format through the requested API without overriding getRangeQuery, with the existing behavior preserved.

Written by the indexing model from the issue text.