moved DummySecurityService to /src/test/
removed rebindable test from onlineHelper.runPlan
All instances of CREATE_AS_BINDING_POSITION use one from
OperatorAssembler, which is not public
cleaned up  OperatorAssembler.assembleCreateAsTemp
Added more tests
Multiple table sources in create as select query are now checked for in
BasicDDLFunctions.createTable as this is currently not a legal create
query