Remove pre-1.1.0 sections of core plugin update scripts (Bug 1301109)

Remove support for upgrading from pre-1.1.0, from core plugins.

Change-Id: I7dce8210152b75cc0931894bb21450805294c5b3
Signed-off-by: Nigel Cunningham <nigelc@catalyst-au.net>
Merge "Remove pre-1.1.0 sections of core plugin update scripts (Bug 1301109)"