General ux improvements around binary names and configuration options

[travisperson]

We have a pretty consistent prefix on a lot of things. The basics are that binaries start with lotus-, and environment vars start with LOTUS_. This doesn't hold true for a few things.

The following

• stats
• fountain
• chainwatch
• bench
• health

Binaries which follow this pattern

• lotus
• lotus-storage-miner
• lotus-shed
• lotus-seed
• lotus-seal-worker

LOTUS_STORAGE_PATH is a bit of an unfortunate name as "storage" is pretty generic and most people actually refer to running the lotus-storage-miner as just a miner. I think it gets a bit more confusing when seen on the lotus-seal-worker.

The lotus-seal-worker repo environment variable doesn't follow the same naming convention as both the lotus daemon or the miner, with WORKER_PATH.

---

At a minimum I'd like to update the Makefile to prefix all binaries with lotus-. Renaming any binaries or updating the environment variables I don't have a solid proposal but I think a start might be:

type	Old	New
binary	lotus-storage-miner	lotus-miner
env	LOTUS_STORAGE_PATH	LOTUS_MINER_PATH
env	WORKER_PATH	LOTUS_SEAL_WORKER_PATH
binary	stats	lotus-stats
binary	fountain	lotus-fountain
binary	chainwatch	lotus-chainwatch
binary	bench	lotus-bench
binary	health	lotus-health

Along with these would come updates the the cli flags: most notably the seal worker --storagerepo flag would be --minerrepo or --miner-repo.

[jimpick]

Please please please rename WORKER_PATH at least.