Removed redundant methods from singletenant drivers

setup_network,get_network_allocations methods
are not called by manager in singletenant drivers.
So we do not need to define them.

Partially-implements bp setup-teardown-server-enhancements

Change-Id: I17d1f26dfc1e322738991f65aac8beb216e47a98
Merge "Removed redundant methods from singletenant drivers"