Miguel Grinberg b5fbb9a673 Use a shared session key among Horizon nodes
This change adds a configuration setting for the Horizon session key. If
present, this key is set into all Horizon nodes, so that they can share
sessions.

Change-Id: I94f46f3adb8fa26965959d5e8c6473eff1b4591c
Closes-bug: 1403611
2014-12-17 18:10:03 -08:00
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