Update dib-run-parts

dib-run-parts in dib-utils had several fixes missing that had been
committed to diskimage-builder. When diskimage-builder switched to using
dib-run-parts from dib-utils, we lost these fixes. The switch over
happened in Ia0a0df7784a14c49b5c47ac0b03e6c2602c84b3b

These are the fixes from diskimage-builder that this commit adds back:
I44cf98dfc80cfcaec54b88cc83be80a3dbf2cec3
I24fd76c2b4f66b8036010b5079db39ead729abee
Iad2d490c86dceab148ea9ab08f457c49a5d5352e
Ieb48faacb4c96b7b358771d70c17f2f22d0354f4
Ia68853505485fefbf0890313456e7edb6097666b
Ibfb562c5970b40598fc95da1e8d4beb9d51d7612

Change-Id: Ice4b6a4b3d36a02099a682ae8cda4721211d51d9