ledger-tool: Change --snapshot-archive-path to --snapshots

[steviez]

Summary of Changes

This change makes solana-ledger-tool match solana-validator CLI; the old
flag --snapshot-archive-path is retained as an argument alias and can
still be used for the sake of backwards compatibility.

solana/validator/src/cli.rs

Lines 296 to 302 in 0dcac3f

	.arg(
	Arg::with_name("snapshots")
	.long("snapshots")
	.value_name("DIR")
	.takes_value(true)
	.help("Use DIR as snapshot location [default: --ledger value]"),
	)

Possibly more work to be done to deduplicate the arguments between validator and ledger-tool, but I think that is for another day.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c6c2340) 81.6% compared to head (bf5f4ea) 81.6%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #35019     +/-   ##
=========================================
- Coverage    81.6%    81.6%   -0.1%     
=========================================
  Files         830      830             
  Lines      224837   224837             
=========================================
- Hits       183505   183477     -28     
- Misses      41332    41360     +28     

[brooksprumo]

lgtm, thanks for unifying this arg!