net_func_tests: add calling method name to setupNetworks

It is usually difficult to know which test originated the
setupNetworks calls in the logs. This patch makes it easier to debug

Change-Id: Id5f07be1f2cef54a773deb8dd73967dc55bf2cf0
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/35711
Reviewed-by: Ondřej Svoboda <osvoboda@redhat.com>
Tested-by: Ondřej Svoboda <osvoboda@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>