Do not modify ingress membership when group describe fails (#800)
Do not modify ingress membership when group describe fails (#800)

Currently, when the `DescribeGroup` fails the ingress synch'ing continues
and removes all of the registered backends.

Instead, if the `DescribeGroup` fails the ingress controller should not
modify the registered backends.

Signed-off-by: Steven Kaufer <1611c59115c779c1933cb6ae54a75eaa70f8bc97@us.ibm.com>
chungers/infrakit,kaufers/infrakit,kaufers/infrakit,docker/infrakit,kaufers/infrakit,craigyam/infrakit,chungers/infrakit,thebsdbox/infrakit,craigyam/infrakit,thebsdbox/infrakit,chungers/infrakit,thebsdbox/infrakit,docker/infrakit,docker/infrakit,craigyam/infrakit