bugfix:modify dfget output

[yunfeiyanggzq]

Signed-off-by: yunfeiyangbuaa [email protected]

Ⅰ. Describe what this PR did

make dfget output clear

Ⅱ. Does this pull request fix one issue?

fixes #817

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

now the out put is

--2019-08-22 19:28:46--  https://dl.google.com/go/go1.12.7.src.tar.gz
dfget version:
workspace:10156-1566473326.503
sign:10156-1566473326.503
client:127.0.0.1 connected to node:127.0.1.0:8002
start download by dragonfly...
download SUCCESS !
cost:3.333s length:21976647

--2019-08-22 19:28:08--  https://dl.google.com/go/go1.12.7.src.tar.gz
dfget version:
workspace:7650-1566473288.932
sign:7650-1566473288.932
download FAIL(1104)
cost:0.142s length:-1
reason:1001
error:{"Code":1104,"Msg":"download fail and not back source: 1001"}
exit status 80

[lowzj]

use pkg/printer instead of fmt

[codecov-io]

Codecov Report

Merging #852 into master will increase coverage by 0.04%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #852      +/-   ##
==========================================
+ Coverage   39.64%   39.68%   +0.04%     
==========================================
  Files         109      109              
  Lines        6430     6431       +1     
==========================================
+ Hits         2549     2552       +3     
+ Misses       3672     3671       -1     
+ Partials      209      208       -1

Impacted Files	Coverage Δ
cmd/dfget/app/server.go	60% <0%> (ø)	⬆️
cmd/dfdaemon/app/version.go	69.23% <0%> (ø)	⬆️
cmd/dfget/app/version.go	69.23% <0%> (ø)	⬆️
cmd/supernode/app/version.go	69.23% <0%> (ø)	⬆️
...core/downloader/back_downloader/back_downloader.go	62.26% <100%> (ø)	⬆️
cmd/dfget/app/root.go	65.45% <100%> (+0.21%)	⬆️
dfget/core/core.go	52.63% <80%> (+0.31%)	⬆️
supernode/daemon/mgr/dfgettask/manager.go	47.74% <0%> (-0.47%)	⬇️
supernode/daemon/mgr/scheduler/manager.go	24.81% <0%> (+0.75%)	⬆️
cmd/dfdaemon/app/root.go	63.63% <0%> (+1.29%)	⬆️

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[yunfeiyanggzq]

use pkg/printer instead of fmt

I have changed fmt to pkg/printer. @lowzj

[lowzj]

• change fmt to pkg/printer in BackDownloader
• the example in dfget/app/root should be updated

[yunfeiyanggzq]

* change `fmt` to `pkg/printer` in `BackDownloader`

* the example in `dfget/app/root` should be updated

Done @lowzj

[lowzj]

LGTM