Fix Sieve.long_header_field

which had multiple problems.  I don't understand how this ever worked.
Remove sphinxpartition from default config

We don't use this anymore, and it was breaking the cyr_info lint test.
Update Conversations.bogus_in_reply_to

which broke when we implemented subject splitting for conversations.
Fix loading of services from existing cyrus.conf

so that it actually happens.
Adjust Delivery tests for Bug 3690

which removed the "compatibility" mode for duplicate suppression.
nofolder test - select another folder first

Otherwise the currently selected folder doesn't exist too early now,
and xconvmultisort bails.