Remove armhf/armv7 support from faasd

See notes in: #364

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go

@@ -80,6 +80,13 @@ func Uint32() uint32 {
 	return r.Uint32()
 }
 
+// ExpFloat64 implements rand.ExpFloat64 on the grpcrand global source.
+func ExpFloat64() float64 {
+	mu.Lock()
+	defer mu.Unlock()
+	return r.ExpFloat64()
+}
+
 // Shuffle implements rand.Shuffle on the grpcrand global source.
 var Shuffle = func(n int, f func(int, int)) {
 	mu.Lock()