[bug] CI fail with TestRuntime

[chuanchang]

Ⅰ. Issue Description

11:43:04 FAIL: /go/src/github.com/alibaba/pouch/test/api_container_create_test.go:180: APIContainerCreateSuite.TestRuntime
11:43:04 
11:43:04 /go/src/github.com/alibaba/pouch/test/api_container_create_test.go:200:
11:43:04     CheckRespStatus(c, resp, 201)
11:43:04 /go/src/github.com/alibaba/pouch/test/util_api.go:25:
11:43:04     c.Assert(resp.StatusCode, check.Equals, status, check.Commentf("Error:%s", got.Message))
11:43:04 ... obtained int = 500
11:43:04 ... expected int = 201
11:43:04 ... Error:unknown runtime runv

Ⅱ. Describe what happened

as above

Ⅲ. Describe what you expected to happen

the test result is ok for PouchLogsSuite.TestRuntime

Ⅳ. How to reproduce it (as minimally and precisely as possible)

1. to compile upstream pouch
2. run pouch daemon in background
3. run test PouchLogsSuite.TestRuntime

Ⅴ. Anything else we need to know?

Test result is passed on Ubuntu 16.04.4

Ⅵ. Environment:

• pouch version (use pouch version):
  #git rev-parse HEAD
  3f0c62f

• OS (e.g. from /etc/os-release):
  #cat /etc/os-release
  NAME="Alibaba Group Enterprise Linux Server"
  VERSION="7.2 (Paladin)"
  ID="alios"
  ID_LIKE="fedora"
  VERSION_ID="7.2"
  PRETTY_NAME="Alibaba Group Enterprise Linux Server 7.2 (Paladin)"
  ANSI_COLOR="0;31"
  CPE_NAME="cpe:/o:alibaba:enterprise_linux:7.2:GA:server"
  HOME_URL="https://www.aliyun.com/"
  BUG_REPORT_URL="http://bbs.aliyun.com/"

ALIBABA_BUGZILLA_PRODUCT="Alibaba Group Enterprise Linux 7"
ALIBABA_BUGZILLA_PRODUCT_VERSION=7.2
ALIBABA_SUPPORT_PRODUCT="Alibaba Group Enterprise Linux"
ALIBABA_SUPPORT_PRODUCT_VERSION=7.2

• Kernel (e.g. uname -a):
  #uname -a
  Linux r10a07137.sqa.zmf 4.9.65-006.ali3000.alios7.x86_64 add travis.yml for CI #1 SMP Mon Dec 4 14:39:09 CST 2017 x86_64 x86_64 x86_64 GNU/Linux