Network topology and inventory init

- Includes network topology creation when NE gets mounted including
CLLI, Openroadm-Network and Openroadm-Topology
- Abstracts network model for Roadm and Xponder nodes
- Derives Roadm-to-Roadm links from LLDP config and notifications
- Provides RPC to create Xponder-input and Xponder-output links
- Includes functionality to update available and used pool based
on service-create and service-delete request
- Remove log error for LLDP subtree
Differences with initial change from ATT-Sandbox branch
- Fix code design issues pointed by Juraj (Patch Set 5)
https://git.opendaylight.org/gerrit/#/c/68859/5
- fix inventory feature building

Co-Authored-By: Dhruv Bhardwaj <db929a@att.com>
Co-Authored-By: Shweta Vachhani <sv111y@att.com>
Co-Authored-By: Masha Dorfman <>
Co-Authored-By: Archana Soundararajan <as7463@att.com>
Co-Authored-By: Juraj Veverka <Juraj.Veverka@pantheon.tech>
Co-Authored-By: Samuel Kontri <samuel.kontris@pantheon.sk>
Co-Authored-By: Andrej Zan <andrej.zan@pantheon.sk>
Co-Authored-By: Milan Fratrik <>
Co-authored-by: Martial COULIBALY <martial.coulibaly@gfi.fr>
Change-Id: I440caf77157d2fa5a5b17ab048252c96833e7561
Signed-off-by: Shweta <sv111y@att.com>
Signed-off-by: Martial COULIBALY <martial.coulibaly@gfi.fr>