WFLY-1547 Use the new TempFileProvider#create() VFS API which allows cleaning existing content

The commit here upgrade VFS to 3.2.0.Beta2 and uses the newly exposed API which allows cleaning existing content from the temp dir. This is required to fix https://issues.jboss.org/browse/WFLY-1547

P.S: Brian, the current code which was creating a TempFileProvider was already dealing with IOException by rethrowing it as a failure. So I decided to let it stay this way instead of the other option of just logging it and moving forward, which we had discussed the other day.