Disable the delve --log option by default.

[bawr]

This is a small patch that makes it possible to toggle delve's debugging output.

I've found it to introduce a lot of pointless noise, distracting from meaningful stderr output.

[msftclas]

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[msftclas]

@bawr, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

Thanks, MSBOT;

[lukehoban]

Looks good - thanks!