OPENIG-106 CR-3765 Fix checkstyle errors
* Removed public fields and introduce getter/setter when needed
* Mandatory properties are passed through constructor (currently, they're not mutable, but we could change that if necessary)

git-svn-id: https://svn.forgerock.org/openig@275 dbb9e58e-28e6-4ce0-90e8-f11d9605b710