Add support for a neutron-based install

Update the trove-integration scripts to be able to install and
configure trove based on Neutron instead of Nova-network.

Co-authored by: Anna Shen <ruiyuan.shen@hp.com>

Partially-implements bp: neutron-support
Change-Id: Iec4773802034c42ddaeaa3c2f2c7cf4af3ee93ee
Merge "Add support for a neutron-based install"