devstack: use branch instead of SHA1 to clone Skydive
devstack: use branch instead of SHA1 to clone Skydive

Change-Id: I4fb999fbc1c10e64ae0626e9b2a64c91f21b17c7
Reviewed-on: https://softwarefactory-project.io/r/5607
Reviewed-by: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>
Tested-by: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>
Workflow: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>

lebauce/skydive,safchain/skydive,lebauce/skydive,redhat-cip/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,skydive-project/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,skydive-project/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,lebauce/skydive,redhat-cip/skydive,lebauce/skydive,skydive-project/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,redhat-cip/skydive,safchain/skydive