add migration script from old encryption to new one

apps/encryption/appinfo/app.php

apps/encryption/appinfo/application.php

apps/encryption/appinfo/info.xml

apps/encryption/appinfo/register_command.php

apps/encryption/command/migratekeys.php

apps/encryption/lib/migration.php

apps/encryption/tests/lib/MigrationTest.php

lib/private/encryption/manager.php

lib/private/encryption/util.php

lib/private/files/storage/wrapper/encryption.php

lib/private/server.php

settings/admin.php

settings/templates/admin.php

tests/lib/encryption/managertest.php