Dockerfile: Drop edge/community for google-authenticator

* Use the primary repository now that google-authenticator is available
  from alpine:v3.5.

Related to #262

Author: kylemanna

Dockerfile

@@ -5,10 +5,8 @@ FROM alpine:3.5
 
 MAINTAINER Kyle Manna <[email protected]>
 
-# Community: google-authenticator
 # Testing: pamtester
-RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/community/" >> /etc/apk/repositories && \
-    echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repositories && \
+RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repositories && \
     apk add --update openvpn iptables bash easy-rsa openvpn-auth-pam google-authenticator pamtester && \
     ln -s /usr/share/easy-rsa/easyrsa /usr/local/bin && \
     rm -rf /tmp/* /var/tmp/* /var/cache/apk/* /var/cache/distfiles/*