Remove unused _get_flags method from integrated_helpers
Remove unused _get_flags method from integrated_helpers

_get_flags method was mainly used by sample tests to add
extensions which are no more valid as sample tests are merged
for extensions and running with all extensions enable.

This patch removes this unused method.

Partially implements blueprint api-sample-tests-with-all-extensions

Change-Id: I92bb2f4fe7c61183f95883cc9f31860f66b9a0b5

Juniper/nova,phenoxim/nova,openstack/nova,sebrandon1/nova,hanlind/nova,klmitch/nova,gooddata/openstack-nova,rajalokan/nova,rajalokan/nova,gooddata/openstack-nova,Juniper/nova,mahak/nova,rahulunair/nova,hanlind/nova,openstack/nova,gooddata/openstack-nova,mikalstill/nova,klmitch/nova,gooddata/openstack-nova,rajalokan/nova,rajalokan/nova,cloudbase/nova,vmturbo/nova,alaski/nova,openstack/nova,rahulunair/nova,phenoxim/nova,jianghuaw/nova,jianghuaw/nova,cloudbase/nova,vmturbo/nova,klmitch/nova,mahak/nova,klmitch/nova,rahulunair/nova,sebrandon1/nova,mahak/nova,sebrandon1/nova,Juniper/nova,vmturbo/nova,mikalstill/nova,Juniper/nova,jianghuaw/nova,cloudbase/nova,vmturbo/nova,jianghuaw/nova,mikalstill/nova,hanlind/nova,alaski/nova