Use build-arg to make FROM image a variable
Change-Id: Iea771b76e40aebce28cf61e79be90bb77d2fc1f8
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FROM centos:7
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ARG FROM=centos:7
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FROM ${FROM}
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ENV PATH=/var/lib/openstack/bin:$PATH
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ENV PROJECT=keystone
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FROM debian:jessie-slim
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ARG FROM=debian:jessie-slim
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FROM ${FROM}
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ENV PATH=/var/lib/openstack/bin:$PATH
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ENV PROJECT=keystone
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FROM ubuntu:xenial
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ARG FROM=ubuntu:xenial
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FROM ${FROM}
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ENV PATH=/var/lib/openstack/bin:$PATH
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ENV PROJECT=keystone
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