Reform fluxsvc tests
Reform fluxsvc tests

Since we moved a lot of operations to the daemon (e.g., git
manipulations), there is less to test about the fluxsvc API. This
commit reduces the (nearly) end-to-end tests in fluxsvc_test to the
things that have effects in the service, rather than the daemon.

squaremo/flux,squaremo/flux,weaveworks/flux,weaveworks/flux