DRILL-2383: Support to inject exceptions and pauses in various components of Drill
+ Controls are fired only if assertions are enabled
+ Controls can be introduced in any class that has access to FragmentContext/QueryContext
+ Controls can be fired by altering the DRILLBIT_CONTROL_INJECTIONS session option
+ Renames: SimulatedExceptions => ExecutionControls, ExceptionInjector => ExecutionControlsInjector
+ Added injection sites in Foreman, DrillSqlWorker, FragmentExecutor
+ Unit tests in TestDrillbitResilience, TestExceptionInjection and TestPauseInjection
Other commits included:
+ DRILL-2437: Moved ExecutionControls from DrillbitContext to FragmentContext/QueryContext
+ DRILL-2382: Added address and port to Injection to specify drillbit
+ DRILL-2384: Added QueryState to SingleRowListener and assert that state is COMPLETED while testing
Other edits:
+ Support for short lived session options in SessionOptionManager (using TTL in OptionValidator)
+ Introduced query count in UserSession
+ Added QueryState to queryCompleted() in UserResultsListener to check if COMPLETED/CANCELED
+ Added JSONStringValidator to TypeValidators
+ Log query id as string in DrillClient, WorkEventBus, QueryResultHandler
+ Use try..catch block only around else clause for OptionList in FragmentContext
+ Fixed drillbitContext spelling error in QueryContext
+ Fixed state transition when cancel() before run() in FragmentExecutor
+ Do not call setLocalOption twice in FallbackOptionManager
+ Show explicitly that submitWork() returns queryId in UserServer
+ Updated protocol/readme.txt to include an alternative way to generate sources
