cannot find package "github.com/alibaba/pouch/storage/volume/modules/ceph"

[chuanchang]

Ⅰ. Issue Description

To build deb package, and then you will hit error like this "volume_build.go:7:8: cannot find package "github.com/alibaba/pouch/storage/volume/modules/ceph" in any of:
/tmp/pouchbuild/src/github.com/alibaba/pouch/vendor/github.com/alibaba/pouch/storage/volume/modules/ceph (vendor tree)
/usr/local/go/src/github.com/alibaba/pouch/storage/volume/modules/ceph (from $GOROOT)
/tmp/pouchbuild/src/github.com/alibaba/pouch/storage/volume/modules/ceph (from $GOPATH)
"

Ⅱ. Describe what happened

cannot find package "github.com/alibaba/pouch/storage/volume/modules/ceph"

Ⅲ. Describe what you expected to happen

can successfully build deb package

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

1. ./hack/package/package.sh 0.5.0 1.el7.centos /root/rpm deb

Ⅴ. Anything else we need to know?

it's okay for build rpm package

Ⅵ. Environment:

• pouch version (use pouch version):
  don't need pouch to install, the pouch:deb container image will be used instead

• OS (e.g. from /etc/os-release):
  $ cat /etc/os-release
  NAME="CentOS Linux"
  VERSION="7 (Core)"
  ID="centos"
  ID_LIKE="rhel fedora"
  VERSION_ID="7"
  PRETTY_NAME="CentOS Linux 7 (Core)"
  ANSI_COLOR="0;31"
  CPE_NAME="cpe:/o:centos:centos:7"
  HOME_URL="https://www.centos.org/"
  BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

• Kernel (e.g. uname -a):
  $uname -a
  Linux izj6cfln087djyclspbpngz 3.10.0-693.2.2.el7.x86_64 add travis.yml for CI #1 SMP Tue Sep 12 22:26:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

• Install tools:

• Others: