support to set root dir of container log

[wangforthinker]

Signed-off-by: allen.wang allen.wq@alipay.com

Ⅰ. Describe what this PR did

The PR allows user to set container log path by parameters log-opt. There are two ways to set container log path.

1. Set root dir of container log by pouch daemon config. For example:

Start pouchd with --log-opt.

/usr/local/bin/pouchd --log-opt root-dir=/tmp/daemon_log

Or set it to pouch config file like this:

{
...
"default-log-config": {
        "Config":{
            "root-dir":"/tmp/daemon_log"
        }
    },
...
}

By this way, all new container will be applied this feature. The container log path will be /tmp/daemon_log/<cid>/json.log

2. Set root dir of container log by container create config. For example:

pouch run -d --name=test --log-opt root-key=/tmp/container_log busybox:latest sh -c "echo hello"

By this way, only the created container with "--log-opt root-key=/tmp/container_log" will be applied this feature. The container log path will be /tmp/container_log/<cid>/json.log.

the second way has the high priority.

Ⅱ. Does this pull request fix one issue?

fix #2783.

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

add test.

Ⅳ. Describe how to verify it

by test.

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Merging #2797 into master will decrease coverage by <.01%.
The diff coverage is 62.16%.

@@            Coverage Diff             @@
##           master    #2797      +/-   ##
==========================================
- Coverage   69.41%   69.41%   -0.01%     
==========================================
  Files         278      278              
  Lines       17340    17373      +33     
==========================================
+ Hits        12037    12059      +22     
- Misses       3965     3975      +10     
- Partials     1338     1339       +1

Flag	Coverage Δ
#criv1alpha2_test	39.26% <35.13%> (-0.06%)	⬇️
#integration_test_0	36.56% <40.54%> (+0.04%)	⬆️
#integration_test_1	35.25% <35.13%> (-0.06%)	⬇️
#integration_test_2	36.48% <59.45%> (+0.09%)	⬆️
#integration_test_3	35.37% <51.35%> (ø)	⬆️
#node_e2e_test	35.11% <35.13%> (-0.02%)	⬇️
#unittest	28.72% <0%> (-0.07%)	⬇️

Impacted Files	Coverage Δ
daemon/mgr/container.go	60.89% <33.33%> (+0.29%)	⬆️
daemon/mgr/container_validation.go	42.52% <33.33%> (-0.41%)	⬇️
daemon/mgr/container_logs.go	82.5% <50%> (-1.92%)	⬇️
daemon/mgr/container_logger.go	78.43% <75%> (-4.91%)	⬇️
pkg/streams/utils.go	82.14% <0%> (-7.15%)	⬇️
daemon/mgr/spec_linux.go	79% <0%> (-1.07%)	⬇️
daemon/mgr/container_utils.go	81.81% <0%> (-0.57%)	⬇️
cri/v1alpha2/cri.go	71.48% <0%> (+0.25%)	⬆️
ctrd/container.go	55.25% <0%> (+0.95%)	⬆️
... and 1 more

[HusterWan]

LGTM