Summary: This fuels commands to be executed for different sandcastle jobs. This is a nice way to separate RocksDB specific commands from Sandcastle specific job definition.
Test Plan: None. Will be tested when we add Sandcastle job.
Reviewers: igor, sdong
Reviewed By: sdong
Subscribers: dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D45741
krad