[odl-sfc] Add timeout to get_vnf_id and create_vnf functions
[odl-sfc] Add timeout to get_vnf_id and create_vnf functions

create_vnf function could end up in and endless loop if it is not able to
retrieve the VNF id. Also, a timeout could help to detect problems when
instantiation is too slow.

Change-Id: I21744338a73f122d0c7a8fbe699738b11a7e2b76
Signed-off-by: Juan Vidal <b0a393ff501543c8f7e2cceda0fb955d54baeeb9@ericsson.com>

opnfv/functest,mywulin/functest,mywulin/functest,opnfv/functest