CHANGES: update change file for release 5.2.0
CHANGES: update change file for release 5.2.0

Signed-off-by: Rohit Yadav <902b9eb5dd62819678163bd5e00fbf0cbc7c264b@shapeblue.com>

Interoute/cloudmonkey-interoute,Interoute/cloudmonkey-interoute,apache/cloudstack-cloudmonkey,remibergsma/cloudstack-cloudmonkey,remibergsma/cloudstack-cloudmonkey,apache/cloudstack-cloudmonkey