Implement load balancing#162

Merged

mvollmary merged 12 commits intomasterfrom

Nov 23, 2017

Commits on Nov 10, 2017

Implement load balancing
mpv1989
committed

Commits on Nov 13, 2017

Implement failover for singleServer with failover
mpv1989
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Add property loading for `acquireHostList` and `loadBalancingStrategy`
mpv1989
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Add load balancing docs
mpv1989
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snapshot version 4.3.0-SNAPSHOT
mpv1989
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Fix bug random host handler
mpv1989
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Commits on Nov 14, 2017

Fix test properties
mpv1989
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Implement following redirects
mpv1989
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Load balancing/ fallback refactoring
mpv1989
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Commits on Nov 17, 2017

Change redirect to response code 503 and header 'x-arango-endpoint'
mvollmary
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Commits on Nov 23, 2017

Fix acquireHostList db call
mpv1989
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Fix changelog
mpv1989
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