This adds a new git fetcher. In doing so, it also refactors how the
fetchers work a bit to better support fetchers that need to resolve
user-provided sources to fully specified sources appropriate for a
lockfile.
Signed-off-by: Steven Danna <steve@chef.io>
this happens when the profile is run (exec) and also interpreted (via profile.params). It will load 2 profile context calls (both via Runner) which in turn gets 2 rounds of interpreter+runner executions. This is an issue with auto-generated IDs, due to their random component, which changes in this case
