getdeps: memoize eden prefetched dirs
Summary: currently, the implementation of `eden prefetch` calls into a mercurial function that is overly eager in making network connections, which results in what should be a fast NOP second prefetch call taking more time than is desirable. This diff adds a little cache to avoid repeatedly calling prefetch for the same directory more than once for the life of the getdeps process. Given the usage pattern of getdeps it is OK that we don't provide a way to invalidate this cache. Reviewed By: fanzeyi Differential Revision: D18005408 fbshipit-source-id: 0ec3f477da1043a5a715704b512c81fcfaa0acde
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