Removed --private option from aleth

[twinstar26]

Issue Name: Remove --private option from aleth #5531
--private option from aleth has been removed.

[codecov-io]

Codecov Report

Merging #5538 into master will increase coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #5538      +/-   ##
==========================================
+ Coverage   61.88%   61.91%   +0.02%     
==========================================
  Files         344      344              
  Lines       28769    28757      -12     
  Branches     3269     3267       -2     
==========================================
+ Hits        17805    17806       +1     
+ Misses       9795     9783      -12     
+ Partials     1169     1168       -1

[halfalicious]

Can you please update your PR description to mention the issue that you're fixing (and please be sure to include a "#" before the issue ID so that the issue is automatically updated with a link to this PR)?

[halfalicious]

Can you also please remove the definition for enableDiscovery and remove this line in main where it's set to false:

aleth/aleth/main.cpp

Lines 378 to 384 in 4f638b0

	if (vm.count("test"))
	{
	testingMode = true;
	enableDiscovery = false;
	disableDiscovery = true;
	bootstrap = false;
	}

Also please replace the check for enableDiscovery here with a check for !disableDiscovery:

aleth/aleth/main.cpp

Line 926 in 4f638b0

if (bootstrap || !remoteHost.empty() || enableDiscovery || listenSet || !preferredNodes.empty())

[halfalicious]

Looks good overall, just some minor changes

[chfast]

How do the options for enable/disable discovery look like now?