Stop hitting remote cache after a few failures

[jaredpalmer]

Close #541

When the remote cache fails or timesout more than n times (twice at the moment), turbo will cease trying to hit the remote cache.

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[gsoltis]

This looks like it's coming along.

One general Go comment to add: for methods or functions that are not intended to be used outside of a package, they can be kept private by starting the name with a lowercase letter. So IsProtocolExternal can be isProtocolExternal. Test code is typically part of the same package, so this does not impact the ability to write tests for this code.

Along those lines, it might be nice to have a quick test demonstrating some typical internal vs external references.

[jaredpalmer]

What's this in reference to @gsoltis ?

[gsoltis]

Whoa, weird, that was a comment I made for a different PR authored via VSCode. I was wondering where it went...