Bug 6875 de-nesting C4::VirtualShelves

Bug 6875 de-nesting C4::VirtualShelves

* C4::Circulation is unused, removing it
* C4::Members used only in ShelfPossibleAction, switching from use to require
* C4::Auth used only in RefreshShelvesSummary, a sub called only in
opac-addbybiblionumber.pl script, moving the require inside the sub

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
(cherry picked from commit 4d2cfa610e0adf22a2bd1dce2647aad15683a2b9)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>
(cherry picked from commit 6eb50992e85146dbc021493d290de7294355c646)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>