Update build env and add new default commandline.

Dockerfile

@@ -1,5 +1,9 @@
 # build stage
-FROM golang:alpine AS build-env
+# Using 1.10 because earlier versions of Go cause the following error:
+#  golang.org/x/crypto (download)
+#  package math/bits: unrecognized import path "math/bits" (import path does
+#  not begin with hostname)
+FROM golang:1.10-alpine AS build-env
 RUN apk --no-cache add git
 ADD * /go/src/app/
 RUN go get -v app && go install -v app
@@ -12,6 +16,6 @@ COPY keys/ /root/.ssh/
 EXPOSE 9999
 CMD /usr/bin/zfs_replication_exporter \
       -logtostderr \
-      -host mom.xinu.tv:22 \
+      -host mom.xinu.tv:2222 \
       -user localuser \
       -addr :9999