Fix: do not append the UTC time zone suffix 'Z' to datetime values having timezone info set.
Fix: do not append the UTC time zone suffix 'Z' to datetime values
having timezone info set.

git-svn-id: 5b1347ddac5aba1438c637217dfe0bb137609099@216 8efdbd46-c5fb-49ab-9956-99f62928ec21

icatproject/python-icat