dovetail: docker build not set branch parameter

dovetail: docker build not set branch parameter

JIRA: DOVETAIL-354

1)in https://build.opnfv.org/ci/view/dovetail/job/dovetail-compass-baremetal-debug-master/200/artifact/results/dovetail_report.txt
Version isn't correct, version should be obtained from https://git.opnfv.org/dovetail/tree/setup.cfg
2)since dovetail not have A/B/C/D branches such as Danube, no need to set branch parameter
when doing "docker build", if branch parameter settled, the "version" info in setup.cfg will not obtained.
3)related patch https://gerrit.opnfv.org/gerrit/#/c/29045/

Change-Id: I2b2880e417460a4a3da3e108bb83800e2acb3a83
Signed-off-by: MatthewLi <matthew.lijun@huawei.com>