Added a stub for initialize the image store client
Added a stub for initialize the image store client

Signed-off-by: David Lee <15c338f3b79a63a0d5423e9c6562cd312918fe74@gmail.com>

mingjian2049/zstack-utility,zstackorg/zstack-utility,live4thee/zstack-utility,zstackio/zstack-utility,live4thee/zstack-utility,mrwangxc/zstack-utility,live4thee/zstack-utility,zstackio/zstack-utility,mrwangxc/zstack-utility,mingjian2049/zstack-utility,mrwangxc/zstack-utility,zstackorg/zstack-utility,mingjian2049/zstack-utility,zstackorg/zstack-utility,zstackio/zstack-utility