Martin Lowe authored Aug 23, 2019 and Christopher Guindon committed Oct 16, 2019

Added base sync functionality, added prefetching, added repo caching.

Change-Id: I0d2d20ba1bf1b013cbfafb97422b9d0c8af1e170
Signed-off-by: Martin Lowe <martin.lowe@eclipse-foundation.org>