Remove local_resources_ from node_manager

[pcmoritz]

see

ray/src/ray/raylet/node_manager.h

Line 393 in 3e33f6f

const SchedulingResources local_resources_;

According to @atumanov it is not used at the moment after initialization. This will make the code clearer, especially in the presence of custom resources @romilbhardwaj

[atumanov]

closed via #3532