branch bzr from the most relevant branch when pushing a new bzr branch

[termie]

right now we always branch from master when we push a new branch, what we should do is figure out what the bzr tracking branch for the git branch we made a new git branch from was and bzr branch from that.

In more diagrammy words, if I do:

git clone lp:nova cd nova git import lp:~termie/nova/test_branch git checkout test_branch git checkout -b branch_based_on_test_branch git bzr push lp:~termie/nova/branch_based_on_test_branch

what will actually happen right now is that it will push a branch based on lp:nova rather than a branch based on lp:~termie/nova/test_branch

[termie]

added a feature to git bzr push, --parent_branch that lets you specify which branch to branch from, ideally we could infer this instead of having to specify it so leaving this issue open