[master] CentOS 7: use go-proxy to work around old git version #635
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CentOS 7 comes with a very old (1.8) version of git, which is not compatible
with go modules. We previously applied this fix to individual build scripts
for rootless-extras and the scan-cli-plugin, but now that other bits are
failing as well, lets move this to the Dockerfile for this distro, so that
for other distros we can use "direct" and fetch from GitHub.
Without this, the build of docker/cli (master branch) failed with: