Back out the session_start and session_end hooks feature.

Andrew Dunstan <andrew@dunslane.net>

Commit: 98d54bb7790d5fb0a77173d5e5e3c655901b472c
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2017-11-16T16:35:02Z
Releases: 11.0
Back out the session_start and session_end hooks feature.

It's become apparent during testing that there are problems with at
least the testing regime. I don't think we should have it without a
working test regime, and the difficulties might indicate implementation
problems anyway, so I'm backing out the whole thing until that's sorted
out.

This reverts commits 7459484 9989f92 cd8ce3a

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