goal: added "wallet rename"

[tasosbit]

Added a goal wrapper to the KMD rename wallet API

Usage: goal wallet rename [current wallet name] [new wallet name]

[codecov]

Codecov Report

Attention: Patch coverage is 3.22581% with 30 lines in your changes missing coverage. Please review.

Project coverage is 56.25%. Comparing base (eff5fb4) to head (fe10c8e).
Report is 79 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/goal/wallet.go	4.34%	22 Missing ⚠️
libgoal/wallets.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6161      +/-   ##
==========================================
- Coverage   56.29%   56.25%   -0.04%     
==========================================
  Files         494      494              
  Lines       69958    69989      +31     
==========================================
- Hits        39381    39372       -9     
- Misses      27907    27939      +32     
- Partials     2670     2678       +8     

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[algorandskiy]

Was it tested? consider adding a new e2e expect test

[jannotti]

I'm inclined to accept even without expect script test. I find those expect scripts painful to read/write, and to me this is essentially "UI", we need not be as concerned about perfect correctness here as we try to be on the protocol. This change amounts to little more than a prepackaged curl command.