remote: change hand written methods to not directly access connection
remote: change hand written methods to not directly access connection

The driver dispatch methods access the priv->conn variables directly.
In future we want to dynamically open the connections for the secondary
driver. Thus we want the methods to call a method to get the connection
handle instead of assuming the private variable is non-NULL.

Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

zippy2/libvirt,andreabolognani/libvirt,nertpinx/libvirt,zippy2/libvirt,fabianfreyer/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,libvirt/libvirt,andreabolognani/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jardasgit/libvirt,crobinso/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,olafhering/libvirt,andreabolognani/libvirt,olafhering/libvirt,fabianfreyer/libvirt,zippy2/libvirt,crobinso/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,olafhering/libvirt,zippy2/libvirt,nertpinx/libvirt,jardasgit/libvirt,nertpinx/libvirt,libvirt/libvirt,andreabolognani/libvirt,olafhering/libvirt,jfehlig/libvirt,crobinso/libvirt,jardasgit/libvirt,jfehlig/libvirt,crobinso/libvirt,jfehlig/libvirt