Nomination of Tianwei Wu as XCI committer

Nomination of Tianwei Wu as XCI committer

Tianwei Wu made many important contributions to XCI which includes but
not limited to
- bringing up first prototype for XCI using OpenStack Ansible
- assisting others with the usage of prototype
- bringing Kubespray to XCI
- developing Kubernetes scenario k8-nosdn-nofeature which can be deployed
on multiple Linux Distributions, Ubuntu 16.04 and CentOS 7
- updating documentation
- reviewing changes

His contributions can be seen from following link:
https://gerrit.opnfv.org/gerrit/#/q/owner:wutianwei1%2540huawei.com+(project:releng-xci+OR+project:releng)+status:merged

Please note that XCI started in OPNFV releng repo and some of his
contributions were made while XCI was still developed in releng repo.

Change-Id: I8d7b802a13a0ce1f7eb87ab5811437419572d823
Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>