WIP support graceful configtest and reload with conf from git#4

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solsson wants to merge 25 commits intomasterfrom

Commits on Sep 22, 2016

Upgrades to latest Git release
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Break up into separate images for git installation and git httpd configuration
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Omit the organization prefix so we can use FROM with docker-compose build+image
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Use one container to initialize git repositories with content for a second container, to emulate Kubernetes gitVolume
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Removes misleading image: from downstrea, but keeps depends_on because it seems required for build dependency
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libcurl-gnutls required for local git http clone, and with libcurl present we might just have curl CLI there too
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Looks like there's a severe regression in solsson/httpd:git for 2.9+, with 404 on
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Verified that config reload works with docker httpd, noted as pseudo code
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Test setup, now let's do the scripting
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Refactors git httpd config to allow push, if auth is configured. Yolean/build-contract tests.
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wip httpd with conf from git clone
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