conncache: Reduce log level of resolve failure.
conncache: Reduce log level of resolve failure.

This log is very common in an offline scenario.

Change-Id: If2695e21126810800c0c7661a8b06473bff8b365

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref