Add SetPermissions/PermsSynced/AllowedPublishSubjects/AllowedSubscribeSubjects/AccountName to LeafConnection, and SendPermsAndAccountInfo/InitLeafNodeSmapAndSendSubs/GetPermSyncStatus plus LeafPermSyncResult to LeafNodeManager. Add OnConnectionRegistered internal callback for test synchronization. 10 new unit tests in LeafPermissionSyncTests.cs all passing.