docker: Support showing environment information
Add a make variable SHOW_ENV. When it's set to non empty, print the package information and environment variables. Signed-off-by: NFam Zheng <famz@redhat.com> Message-Id: <1474429768-25027-8-git-send-email-famz@redhat.com> Reviewed-by: NDaniel P. Berrange <berrange@redhat.com>
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