Remove RetryFilter from config

Since Ic0a03e89903bf925638fa26cca3dac7db710dca3 RetryFilter has been
deprecated. So we should not enable the RetryFilter on our tests.

Change-Id: I48c2c4d0714f582af8948dc88b48df1c2c62fcd2
diff --git a/lib/nova b/lib/nova
index 8220e0f..0a091e3 100644
--- a/lib/nova
+++ b/lib/nova
@@ -103,7 +103,7 @@
 
 # The following NOVA_FILTERS contains SameHostFilter and DifferentHostFilter with
 # the default filters.
-NOVA_FILTERS="RetryFilter,AvailabilityZoneFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter,SameHostFilter,DifferentHostFilter"
+NOVA_FILTERS="AvailabilityZoneFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter,SameHostFilter,DifferentHostFilter"
 
 QEMU_CONF=/etc/libvirt/qemu.conf