Add copyright and distribution info to vldb.cls file
Add copyright and distribution info to vldb.cls file

This file was obtained from the VLDB website, and did not originally
contain a license notice. I contacted the ACM and received permission
to distribute and re-use the class file from Bernard Rous, the ACM
Director of Publications, who suggested the particular file header
added in this commit.

Change-Id: Id3c76a70fef53b11898e8279df56c03fbe17fbb4
Reviewed-on: http://gerrit.cloudera.org:8080/2229
Tested-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@apache.org>
Reviewed-by: Mike Percy <e07a1fd797b473a9c849e618aa2ce06d8055760b@apache.org>

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