Update to Go 1.7 in all Docker builds

ConsoleClient/Dockerfile

@@ -22,7 +22,7 @@ RUN apt-get update -y && apt-get install -y --no-install-recommends \
   && rm -rf /var/lib/apt/lists/*
 
 # Install Go.
-ENV GOVERSION=go1.6.2 GOROOT=/usr/local/go GOPATH=/go PATH=$PATH:/usr/local/go/bin:/go/bin CGO_ENABLED=1
+ENV GOVERSION=go1.7 GOROOT=/usr/local/go GOPATH=/go PATH=$PATH:/usr/local/go/bin:/go/bin CGO_ENABLED=1
 
 RUN curl -L https://storage.googleapis.com/golang/$GOVERSION.linux-amd64.tar.gz -o /tmp/go.tar.gz \
    && tar -C /usr/local -xzf /tmp/go.tar.gz \

MobileLibrary/Android/Dockerfile

@@ -17,7 +17,7 @@ RUN apt-get update -y && apt-get install -y --no-install-recommends \
   && rm -rf /var/lib/apt/lists/*
 
 # Install Go.
-ENV GOVERSION=go1.6.2 GOROOT=/usr/local/go GOPATH=/go PATH=$PATH:/usr/local/go/bin:/go/bin CGO_ENABLED=1
+ENV GOVERSION=go1.7 GOROOT=/usr/local/go GOPATH=/go PATH=$PATH:/usr/local/go/bin:/go/bin CGO_ENABLED=1
 
 RUN curl -L https://storage.googleapis.com/golang/$GOVERSION.linux-amd64.tar.gz -o /tmp/go.tar.gz \
   && tar -C /usr/local -xzf /tmp/go.tar.gz \

Server/Dockerfile-binary-builder

@@ -1,6 +1,6 @@
 FROM alpine:latest
 
-ENV GOLANG_VERSION 1.6.2
+ENV GOLANG_VERSION 1.7
 ENV GOLANG_SRC_URL https://golang.org/dl/go$GOLANG_VERSION.src.tar.gz
 
 RUN set -ex \