cmd/tailscale: print more detail in connection failure error message

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Before:

failed to connect to local tailscaled (which appears to be running). Got error: Get "http://local-tailscaled.sock/localapi/v0/status": EOF

After:

failed to connect to local tailscaled (which appears to be running as IPNExtension, pid 2118). Got error: Get "http://local-tailscaled.sock/localapi/v0/status": EOF

This was useful just now, as it made it clear that tailscaled I thought
I was connecting to might not in fact be running; there was
a second tailscaled running that made the error message slightly misleading.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

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This commit is contained in:

500 Internal Server Error

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