Improve ingress rule writing, skip backup compression, explicitly check if Thrift server is listening

(#922) Optionally skip compression of backups
(#943) Optionally make extra check to ensure Thrift server is actually listening on the rpc_port
(#944) Make disk_access_mode a first class configuration option
(#941) Delete secondary index backup directories after uploading
(#940) Improve operator control over creation of ingress rules