Move packages to proejct/pkg to follow go project folder structure convention (#1190)

cmd/builder/Dockerfile.fission-builder

@@ -0,0 +1,26 @@
+FROM golang:1.11-alpine as fission-builder
+RUN apk add bash ca-certificates git gcc g++ libc-dev
+
+ARG GITCOMMIT=unknown
+# E.g. GITCOMMIT=$(git rev-parse HEAD)
+
+ARG BUILDVERSION=unknown
+# E.g. BUILDVERSION=$(git rev-parse HEAD)
+
+ARG BUILDDATE=unknown
+# E.g. BUILDDATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+
+ARG GOPKG=github.com/fission/fission
+COPY . /go/src/${GOPKG}
+WORKDIR /go/src/${GOPKG}/cmd/builder
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+    -o /go/bin/builder \
+    -gcflags=-trimpath=$GOPATH \
+    -asmflags=-trimpath=$GOPATH \
+    -ldflags "-X github.com/fission/fission/pkg/info.GitCommit=${GITCOMMIT} -X github.com/fission/fission/pkg/info.BuildDate=${BUILDDATE} -X github.com/fission/fission/pkg/info.Version=${BUILDVERSION}"
+
+FROM alpine:3.5
+COPY --from=fission-builder /go/bin/builder /
+EXPOSE 8001
+
+ENTRYPOINT ["/builder"]