Stop depending on deb name in splunk download URL

When downloading the deb from splunk’s website, it doesn’t have that
format.
See: http://www.splunk.com/download/universalforwarder
Rename directory to name in inputs config

This doesn’t need to be a directory, it can be just a file (globing also
works).
See http://docs.splunk.com/Documentation/Storm/Storm/User/Editinputsconf
Remove trailing whitespaces
Merge pull request #633 from IONISx/splunk-improvements

Splunk improvements