Comment 11 for bug 1017990

First crack at a fix:

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/jeffdavis/lp1017990-deprecate-hold-create

This logs a warning about the deprecated API calls, moves the bulk of the create_hold method to a separate implementation method, and makes the open-ils.circ.holds.test_and_create.batch[.override] calls use the implementation method directly.