The SDK logs API key secret by default

[amandam11]

Describe the bug
By default (unless the logger is overwritten) then the dotnet SDK logs the full URL it listens to which includes what should be treated as a secret - the API KEY.

For example:
INFO: Opening connection to $http://localhost:8064/features/default/<secret key>

Which area does this issue belong to?

• SDK
• SDK examples
• Documentation
• Other
• [ ]

To Reproduce
Steps to reproduce the behavior:
1.Start client
2. See secret in the logs

Expected behavior
That secret information such as the api key is not logged by default.

Versions
FeatureHub version [1.6.0]
SDK version [using master branch]