add result file to task

[#79618098]

Signed-off-by: Alex Suraci <asuraci@pivotal.io>
add GetTaskByGuid

used by rep to get result filename for completion

[#79618098]

Signed-off-by: Alex Suraci <asuraci@pivotal.io>
Remove FetchResult stuff [#79618098]

Signed-off-by: Alex Suraci <asuraci@pivotal.io>