Add opera support

Add opera support

JIRA: COMPASS-504
JIRA: OPERA-1

Function:
  support open-o deployment by calling opera project.
  open-o deployment will start at the end of normal
  compass4nfv deployment.

Changes:
  1. add scenario and network yaml for opera
  2. add opera_adapter.py for calling opera

Attention:
  The git URL for opera will change after opera patch
  OPERA-2 is meraged. This patch should be modifed
  before meraged.

Change-Id: Id0afcece920c4107bb23f42b460c46eec3ca97e6
Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>