Load balancer appcookie configuration deprecated in HAproxy #3253

The appcookie feature was primary driven by the netscalar implementation (if I recall correctly). Per the haproxy docs As of version 1.6, appsessions was removed. It is more flexible and more convenient to use stick-tables instead, and stick-tables support multi-master replication and data conservation across reloads, which appsessions did not.. We can explore if an upgrade path is possible.

The LB feature needs some overall cleanup and fixing, other than the tcp round-robin (most preferred use-case), SSL off loading etc don't work, as they were primarily netscalar driven in the past. cc @PaulAngus

closing this as unplanned, please reopen if applicable

we faced an issue with appsession today

therefore I reopened this issue.
appsession should be removed from cloudstack source code (java, UI, etc) and documentation.

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