Update images/peer/Dockerfile

I agree

Signed-off-by: Frank Felhoffer <frank.felhoffer@securekey.com>
Co-authored-by: Gari Singh <gari.r.singh@gmail.com>

images/peer/Dockerfile

@@ -10,7 +10,7 @@ RUN apk add --no-cache tzdata
 # set up nsswitch.conf for Go's "netgo" implementation
 # - https://github.com/golang/go/blob/go1.9.1/src/net/conf.go#L194-L275
 # - docker run --rm debian:stretch grep '^hosts:' /etc/nsswitch.conf
-RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
+RUN echo 'hosts: files dns' > /etc/nsswitch.conf
 
 FROM golang:${GO_VER}-alpine${ALPINE_VER} as golang
 RUN apk add --no-cache \