Copyright for walinuxagent source package in Focal

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0
Upstream-Name: walinuxagent
Upstream-Contact: Microsoft Corporation 
Source: https://github.com/Windows-Azure/WALinuxAgent/

Files: *
Copyright: 2012-2017, Microsoft Corporation 
License: Apache-2.0

Files: debian/*
Copyright: 2012-2017, Canonical Group, Ltd
License: Apache-2.0

License: Apache-2.0
 On Debian systems, the complete text of the Apache version 2.0 license
 can be found in "/usr/share/common-licenses/Apache-2.0".