[5.0] Improve cleos error messages

[heifner]

With the addition of #1137 different categories of plugins can be configured to different endpoints. Update cleos error message to provide a better suggestion when feature is not available at provided endpoint.

Example output:

./cleos -u http://127.0.0.1:8081 net peers
Error 3110004: Missing Net API Plugin
Ensure that you have eosio::net_api_plugin added to your node's configuration and enabled on the specified endpoint.
For example:
http-server-address   = http-category-address
http-category-address = net_ro,127.0.0.1:8081
http-category-address = net_rw,[::]:8083
Error Details:
Net API plugin is not enabled on specified endpoint

Also updated history_api_plugin error details:

./cleos -u http://127.0.0.1:8081 get transaction 13fccbfb5f484f23ea081c81ba3dc07cd1eb0ed13e084d5d9e26ddc8f9aa94d1
Error 3110003: Missing History API Plugin
The eosio::history_api_plugin has been removed. Verify endpoint simulates removed history_api_plugin or use a different option.
Error Details:
History API plugin is not enabled on specified endpoint

Resolves #1688

[greg7mdp]

I think it would be nice to provide an example of correct specification in the error message if possible.

[heifner]

I think it would be nice to provide an example of correct specification in the error message if possible.

I don't follow, can you give an example.

[greg7mdp]

I think it would be nice to provide an example of correct specification in the error message if possible.

I don't follow, can you give an example.

Maybe something like the following, if I understand correctly the config:

Error 3110004: Missing Net API Plugin
Ensure that you have eosio::net_api_plugin added to your node's configuration and enabled on the specified endpoint. 
For example:
http-server-address   = http-category-address
http-category-address = net_ro,127.0.0.1:8081
http-category-address = net_rw,[::]:8083