convert restart_required to 'true' or 'false' string
convert restart_required to 'true' or 'false' string

The output of the configuration-parameters-list/show was
inadvertently changed when the parameters were moved into
the database in Juno.

Change-Id: Ic7d215482f5a9ab8ba2059cae7b91a99b35f2795
Closes-Bug: #1379665

fabian4/trove,fabian4/trove,zhujzhuo/openstack-trove,zhangg/trove,mmasaki/trove,mmasaki/trove,hplustree/trove,zhangg/trove,zhujzhuo/openstack-trove,mmasaki/trove,cp16net/trove,zhujzhuo/openstack-trove,cp16net/trove,openstack/trove,openstack/trove,cp16net/trove,redhat-openstack/trove,hplustree/trove,fabian4/trove,redhat-openstack/trove,redhat-openstack/trove