[DEVOPS-1097] resolved ambiguous types

[CodiePP]

Description

resolved ambiguous type; the logging message was looping inifinitely and never delivered.

Linked issue

DEVOPS-1097

Type of change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🛠 New feature (non-breaking change which adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
• 🏭 Refactoring that does not change existing functionality but does improve things like code readability, structure etc
• 🔨 New or improved tests for existing code
• ⛑ git-flow chore (backport, hotfix, etc)

Developer checklist

• I have read the style guide document, and my code follows the code style of this project.
• [~] If my code deals with exceptions, it follows the guidelines.
• [~] I have updated any documentation accordingly, if needed. Documentation changes can be reflected in opening a PR on cardanodocs.com, amending the inline Haddock comments, any relevant README file or one of the document listed in the docs directory.
• [~] CHANGELOG entry has been added and is linked to the correct PR on GitHub.

Testing checklist

• [~] I have added tests to cover my changes.
• [~] All new and existing tests passed.

QA Steps

these steps should be done in the root directory of where cardano-sl was checkout:

1.) compilation: nix-build -A connectScripts.mainnet.wallet --arg forceDontCheck true --cores 0 --max-jobs 4
2.) create file: default-wallet.key with permissions e.g. 755: chmod 755 default-wallet.key
3.) run in one terminal: ./result
4.) run in another terminal: curl -v https://localhost:8090/api/internal/import-wallet -k --cert state-wallet-mainnet/tls/client/client.crt --key state-wallet-mainnet/tls/client/client.key -d '{"filePath":"<<enter absolute path to >>/default-wallet.key"}' -H 'Content-Type: application/json'

Screenshots (if available)

a log entry appears similar to this one:

[cardano-sl.*production*:Warning:ThreadId 389] [2018-10-18 08:05:36.70 UTC] Key file at <<path>>/cardano-sl.git/default-wallet.key has access mode 755 instead of 600. Fixing it automatically.

[CodiePP]

the liftIO is actually not necessary.
together with @365andreas we debugged and traced this to the use site in wallet-new where the function readUserSecret calling ensureModeIs600 was called within a monad KeystoreM (actually IO). This then let to the confusion in the compiler.
Along the way we also found an instance HasLoggerName IO in core which we moved to the correct place in util.