Bug 14751 - Allow C4::Context->interface to be set to 'sip' or 'commandline'

Bug 14751 - Allow C4::Context->interface to be set to 'sip' or 'commandline'

Koha::Logger allows us to split up logging to separate files based on
the interface. However, right now the interface is limited to just
'opac' or 'intranet'.

We should extend this to allow the interface to also be set to 'sip'
for SIP server logging, and to 'commandline' for cronjobs and all other
command line scripts.

Signed-off-by: Chris <chris@bigballofwax.co.nz>
Does what it says on the tin

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com