[bugfix] we should parse env params when create container

[HusterWan]

Ⅰ. Describe what this PR did

We did not parse env params when create a container, just append image env to container env slice. So we will occur errors blow:

we use a test image: mysql:5.7, it has env like blow:

root@osboxes:pouch (master) -> pouch image inspect registry.hub.docker.com/library/mysql:5.7 | grep -A 6 -B 3 Env
            "Entrypoint": [
                "docker-entrypoint.sh"
            ],
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "GOSU_VERSION=1.7",
                "MYSQL_MAJOR=5.7",
                "MYSQL_VERSION=5.7.23-1debian9"
            ],

If we use this image to create a container, and specify an env like GOSU_VERSION=2.0, we will get a container like :

root@osboxes:pouch (master) -> pouch run -d -t --name=test -e "GOSU_VERSION=2.0" -e "test=foo" --net=bridge -v /data  registry.hub.docker.com/library/mysql:5.7 top
00b09689623709005d0910793663aabf454ac0c0fa4006a347545b8403fc6061
root@osboxes:pouch (master) -> pouch inspect test | grep -A 6 -B 3 Env
            "Entrypoint": [
                "docker-entrypoint.sh"
            ],
            "Env": [
                "GOSU_VERSION=2.0",
                "test=foo",
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "GOSU_VERSION=1.7",
                "MYSQL_MAJOR=5.7",
                "MYSQL_VERSION=5.7.23-1debian9"

we have two env GOSU_VERSION, one is GOSU_VERSION=2.0, another is GOSU_VERSION=1.7

Ⅱ. Does this pull request fix one issue?

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

Added testcase

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[rudyfly]

LGTM

[codecov-io]

Codecov Report

Merging #2121 into master will increase coverage by 4.63%.
The diff coverage is 72.41%.

@@            Coverage Diff            @@
##           master   #2121      +/-   ##
=========================================
+ Coverage   60.47%   65.1%   +4.63%     
=========================================
  Files         208     208              
  Lines       16411   16417       +6     
=========================================
+ Hits         9925   10689     +764     
+ Misses       5296    4397     -899     
- Partials     1190    1331     +141

Flag	Coverage Δ
#criv1alpha1test	33.31% <17.24%> (?)
#criv1alpha2test	33.82% <17.24%> (-0.07%)	⬇️
#integrationtest	39.82% <65.51%> (ø)	⬆️
#unittest	24% <58.62%> (+0.1%)	⬆️

Impacted Files	Coverage Δ
daemon/mgr/container.go	55.84% <50%> (-0.27%)	⬇️
daemon/mgr/container_types.go	79.06% <50%> (-2.33%)	⬇️
daemon/mgr/container_utils.go	83.13% <80.95%> (-0.32%)	⬇️
ctrd/watch.go	75.75% <0%> (-4.55%)	⬇️
ctrd/image.go	75% <0%> (-2.2%)	⬇️
daemon/logger/jsonfile/utils.go	71.54% <0%> (-1.63%)	⬇️
cri/v1alpha1/cri_utils.go	83.64% <0%> (+23.06%)	⬆️
cri/criservice.go	64.7% <0%> (+24.99%)	⬆️
cri/v1alpha1/cri_wrapper.go	55.8% <0%> (+55.8%)	⬆️
... and 5 more