[3.1] validate input of set_whitelist_blacklist, add_greylist_accounts and remove_greylist_accounts

[linh2931]

Resolve #86

Add input validation for set_whitelist_blacklist, add_greylist_accounts and remove_greylist_accounts by ensuring at least one optional parameter is present in a RPC call.

Previously,

curl -d '{"foo":["bar"]}' http://127.0.0.1:8888/v1/producer/set_whitelist_blacklist
{"result":"ok"}

Now,

curl -d '{"foo":["bar"]}' http://127.0.0.1:8888/v1/producer/set_whitelist_blacklist
{"code":400,"message":"Invalid Request","error":{"code":3200006,"name":"invalid_http_request","what":"invalid http request","details":[{"message":"At least one of actor_whitelist, actor_blacklist, contract_whitelist, contract_blacklist, action_blacklist, and key_blacklist is required","file":"producer_plugin.cpp","line_number":1382,"method":"set_whitelist_blacklist"}]}}~/work/validate_input_3_1/plugins

curl -d '{"accounts":[]}' http://127.0.0.1:8888/v1/producer/add_greylist_accounts
{"code":400,"message":"Invalid Request","error":{"code":3200006,"name":"invalid_http_request","what":"invalid http request","details":[{"message":"At least one account is required","file":"producer_plugin.cpp","line_number":1338,"method":"add_greylist_accounts"}]}}

curl -d '{"accounts":[]}' http://127.0.0.1:8888/v1/producer/remove_greylist_accounts
{"code":400,"message":"Invalid Request","error":{"code":3200006,"name":"invalid_http_request","what":"invalid http request","details":[{"message":"At least one account is required","file":"producer_plugin.cpp","line_number":1347,"method":"remove_greylist_accounts"}]}}

[heifner]

This is targeting main, but marked as 3.1. It needs to target release/3.1.

[linh2931]

Thanks for noticing this! I intended it for release/3.1 but somehow picked a wrong branch to compare. Will open a new PR for release/3.1 and discard this one.

[heifner]

Thanks for noticing this! I intended it for release/3.1 but somehow picked a wrong branch to compare. Will open a new PR for release/3.1 and discard this one.

Sometimes you can just change the base, worked this time.

[linh2931]

Thanks one more time for changing base branch for me!