Remove legacy Ray code. (#3121)

* Remove legacy Ray code.

* Fix cmake and simplify monitor.

* Fix linting

* Updates

* Fix

* Implement some methods.

* Remove more plasma manager references.

* Fix

* Linting

* Fix

* Fix

* Make sure class IDs are strings.

* Some path fixes

* Fix

* Path fixes and update arrow

* Fixes.

* linting

* Fixes

* Java fixes

* Some java fixes

* TaskLanguage -> Language

* Minor

* Fix python test and remove unused method signature.

* Fix java tests

* Fix jenkins tests

* Remove commented out code.

java/tutorial/pom.xml

@@ -40,7 +40,7 @@
             <RAY_CONFIG>${basedir}/../ray.config.ini</RAY_CONFIG>
           </environmentVariables>
           <argLine>-ea
-            -Djava.library.path=${basedir}/../../build/src/plasma:${basedir}/../../build/src/local_scheduler
+            -Djava.library.path=${basedir}/../../build/src/plasma:${basedir}/../../build/src/ray/raylet
             -noverify
             -DlogOutput=console
           </argLine>