Remove max_size parameter from fake_libvirt_utils.fetch_*image methods
Remove max_size parameter from fake_libvirt_utils.fetch_*image methods

The max_size parameter was removed from the real libvirt utils
fetch_*image methods in change I70a559f3dc9b59097ff6923920f4377cca00d1b2
but missed fake_libvirt_utils.

Change-Id: I2bbaf48b031ae6598d184e6c5675862bfebb95f6

rahulunair/nova,gooddata/openstack-nova,mahak/nova,mikalstill/nova,gooddata/openstack-nova,klmitch/nova,openstack/nova,mikalstill/nova,mahak/nova,klmitch/nova,openstack/nova,gooddata/openstack-nova,klmitch/nova,gooddata/openstack-nova,openstack/nova,mahak/nova,mikalstill/nova,rahulunair/nova,rahulunair/nova,klmitch/nova