Commits on Jul 3, 2020

1. log.WithSuffix, appends kvs to those passed to Log …

   enhancement suggested in:
   go-kit#991
   
   why?
   
   if a human is reading logfmt output on the
   shell or in the web browser, it helps to
   have certain fields prefixed, e.g. ts,
   but certain fields are better suffixed,
   e.g. caller, environment, so that more
   important information appears first.
   
   benchmarks suggest an additional cost
   only if WithSuffix is used.
   
   goos: darwin
   goarch: amd64
   pkg: github.com/go-kit/kit/log
   BenchmarkDiscard-4               	32230156	        38 ns/op	      32 B/op	       1 allocs/op
   BenchmarkOneWith-4               	 9647907	       122 ns/op	      96 B/op	       2 allocs/op
   BenchmarkTwoWith-4               	 8935790	       134 ns/op	     160 B/op	       2 allocs/op
   BenchmarkTenWith-4               	 5016836	       236 ns/op	     672 B/op	       2 allocs/op
   BenchmarkOneWithPrefix-4         	 9907198	       123 ns/op	      96 B/op	       2 allocs/op
   BenchmarkTenWithPrefix-4         	 5076309	       239 ns/op	     672 B/op	       2 allocs/op
   BenchmarkOneWithSuffix-4         	 6432942	       189 ns/op	     128 B/op	       3 allocs/op
   BenchmarkTenWithSuffix-4         	 4899711	       246 ns/op	     416 B/op	       3 allocs/op
   BenchmarkOneWithPrefixSuffix-4   	 6111750	       197 ns/op	     160 B/op	       3 allocs/op
   BenchmarkTenWithPrefixSuffix-4   	 2172066	       555 ns/op	    1952 B/op	       3 allocs/op
   PASS
   ok  	github.com/go-kit/kit/log	14.224s

   Vinay P committed Jul 3, 2020
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