Copyright for excalibur-logkit source package in Xenial

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: excalibur-logkit
Upstream-Contact: The Apache Software Foundation
Source: http://excalibur.apache.org

Files: *
Copyright: 1999-2004, The Apache Software Foundation
License: Apache-2.0

Files: debian/*
Copyright: 2009, Onkar Shinde 
License: Apache-2.0

License: Apache-2.0
 On Debian systems the full text of the Apache-2.0 license can be found in the
 `/usr/share/common-licenses/Apache-2.0' file.