Mark sensitive cfg options with secure flag
Mark sensitive cfg options with secure flag

* Marks sensitive cfg options with the secure attribute
  which prevents them from being logged in the clear

fixes bug#1221902

Change-Id: I86887e58f3fc11cdbbe95d90da9458143c70ec67

denismakogon/trove-guestagent,changsimon/trove,citrix-openstack-build/trove,citrix-openstack/build-trove,changsimon/trove,mmasaki/trove,citrix-openstack/build-trove,fabian4/trove,denismakogon/trove-guestagent,citrix-openstack/build-trove,changsimon/trove,openstack/trove,cp16net/trove,zhujzhuo/openstack-trove,cp16net/trove,mmasaki/trove,fabian4/trove,redhat-openstack/trove,redhat-openstack/trove,zhujzhuo/openstack-trove,cp16net/trove,zhangg/trove,citrix-openstack-build/trove,zhangg/trove,mmasaki/trove,hplustree/trove,redhat-openstack/trove,citrix-openstack-build/trove,openstack/trove,zhujzhuo/openstack-trove,hplustree/trove,fabian4/trove