Reason: When we resolve "FROM" image, ResolveName will first return a list of
candidates which includes localhost/<FROM image name>, then search and
get it from local store. But the image tag we add to built image before
only includes image name, without head "localhost", so it can not be
found.
Signed-off-by: Nxiadanni <xiadanni1@huawei.com>

Merge pull request !5 from jingxiaolu/add_tests

Merge pull request !6 from DCCooper/master

Signed-off-by: NDCCooper <1866858@gmail.com>

Adding new unit tests
Signed-off-by: Njingxiaolu <lujingxiao@huawei.com>

Merge pull request !3 from DCCooper/tests

Signed-off-by: NDCCooper <1866858@gmail.com>

Merge pull request !4 from jingxiaolu/vendor

Add required go modules to vendor
Signed-off-by: Njingxiaolu <lujingxiao@huawei.com>

Merge pull request !2 from jingxiaolu/fix_typo

Fix a small typo
Signed-off-by: Njingxiaolu <lujingxiao@huawei.com>

Merge pull request !1 from jingxiaolu/init

Initial commit for isula-build
Signed-off-by: Njingxiaolu <lujingxiao@huawei.com>