Improve branch build
Improve branch build

If we are rechecking a branch that already exists and the workspace
already exists, we first remove the existing branch and create a new one

Change-Id: I39f0ef5a6f3bdcbc38664ce9b3bf10fb427954d8
Signed-off-by: Diego Dompe <362eb8c2bff4070585be20c53c8ef543d5e46a6b@hp.com>

open-switch/infra_project-config,open-switch/infra_project-config