Signed-off-by: Nxiadanni <xiadanni1@huawei.com>

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>

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

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