Copyright for ehcache source package in Bionic

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Ehcache distributed cache library
Upstream-Contact: Terracotta, Inc.
Source: http://svn.terracotta.org/svn/ehcache/tags/

Files: *
Copyright: 2003-2014 Terracotta, Inc.
License: Apache-2.0
  On Debian systems you can find the complete text of the Apache-2.0
  license in `/usr/share/common-licenses/Apache-2.0'