[yardstick] Pass "BRANCH" variable to yardstick docekr container
Recently update of utils/fetch_os_creds.sh in commit
8359219bae93a028f6205cdc9460654f9e45c217
use a "BRANCH" varibale in fuel environmet
Currently Yardstick didn't pass such variable to yardstick docker, which causes the following error:
/home/opnfv/repos/releng/utils/fetch_os_creds.sh: line 75: BRANCH: unbound variable
This patch fix this error by Pass "BRANCH" variable to yardstick docekr container
Change-Id: Ifcf3df7107b2f4b493b37c7ef5473f170a8edb94
Signed-off-by: JingLu5 <lvjing5@huawei.com>