Now kolla dev mode only support clone master branch from git,
add version tag to support clone dedicated branch.
Change-Id: I88de238e5dc7461ba0662a3ecea9a2d80fd0db60
Provide support fot kolla dev mode in sahara. When
'kolla_dev_mode' or 'sahara_dev_mode' variables are
enabled, source code of sahara project will be cloned
and mounted automatically
Partially implements: blueprint mount-sources
Change-Id: I496ea4443ec8ffc4dc9d0f0d3e6a4514d16ed336
Co-Authored-By: zhulingjie <easyzlj@gmail.com>