Merge tag 'v1.9-rc0' into debian-sid

Git 1.9-rc0
debian: new upstream release candidate

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Merge tag 'v1.9-rc1' into debian-sid

Git 1.9-rc1
debian: new upstream release candidate

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Merge branch 'sign-rebase' into bmc-release