cb080a2066
This commit adds the `fetch` and `fetch.remoteRefSpec` fields to the configuration for repositories, allowing the capability to fetch references from a remote. This is useful for pulling specific gerrit patchsets. This also changes `checkout.remoteRefSpec` to `checkout.refSpec`, and implements the logic required to checkout to an arbitrary ref. Closes: #616 Change-Id: Ie21a6c2a7a7ac92ed3c05fef7e5683203cd62e45