Adding FaaS features into Integration repo

Adding FaaS features into Integration repo

1) Feature Tests Pass: https://jenkins.opendaylight.org/releng/view/faas/job/faas-merge-beryllium/11/

2) Features Comply with Guidelines:
https://git.opendaylight.org/gerrit/gitweb?p=faas.git;a=blob;f=features/src/main/features/features.xml

    a) Feature Names: odl-faas-all

    b) Features Descriptions: Present

    c) Features Start-Levels: No start-levels on <bundle> elements or <feature> elements

3) Features Tested:
    Features have been tested for functionality with

    a) feature:repo-add mvn:org.opendaylight.integration/features-integration-test/0.4.0.SNAPSHOT/xml/features
    b) feature:install odl-integration-compatible-with-all
    c) feature:install odl-faas-all

4) Integration Test Impact: None

Change-Id: Ib9c61f2844c2cba08837cfd47eb75a54f3bf3df2
Signed-off-by: chuxingjun <xingjun.chu@huawei.com>