network/config storage role fixes

network/config storage role fixes

None of the storage roles have Heat parameters for the bridge
name. Instead of wiring in Heat parameters for bridge name
this patch hard codes the bridge name for the storage roles
to 'br-storage'.

This functionally fixes the network config scripts for each
of the storage roles.

For the single-nic-vlans storage roles we also remove
the 'bond1' reference which was also incorrectly specified.

Change-Id: I460d1a17e44ee49e960117ec85edd3ae25894333