Adding POSCA build job for Bottlenecks

JIRA: RELENG-189
JIRA: BOTTLENECK-108

POSCA is a new testsuite in Bottlenecks aiming to locate the bottlenecks in parmetric
manner and to decouple the bottlenecks regarding the deployment requirements.
POSCA testsuite is planed to be released in Danube.
For more details, please refer to https://jira.opnfv.org/browse/BOTTLENECK-92

Change-Id: I9c42903fff64beb4fa15e6dae26e33590a350b93
Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>