
Prior to this patch devstack only supported installing diskimage-builder directly from pip. This patch adds support to also install it from git. This is needed so we can run tests on the diskimage-builder gate to test against Ironic. Depends-On: I6cefac1eb4ebf0196a6b4d4bfc038c00921f0d70 Change-Id: I894b20fc41c195202d2545f6de2791cd6a1b1a30