LP#1677661 Hold targeter live test use API, etc.

LP#1677661 Hold targeter live test use API, etc.

Teach the hold targeter live tests to call the open-ils.hold.targeter
API instead of calling the now-defunct Utils::HoldTargeter batch
targeter function.  Apart from the loss of this function, calling the
API allows the live tests to exercise more of the targeting code.

Teach the live tests to test --soft-retarget-interval instead of the
deprecated --skip-viable option.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jason Stephenson <jason@sigio.com>