Update README.md of analyze_local_image
Update README.md of analyze_local_image

The latest Clair use config file for configuration, the command line to
run Clair instance is outdate in the README.md

Signed-off-by: Lei Jitang <9ac444d2b5df3db1f31aa1c6462ac8e9e2bde241@huawei.com>

Quentin-M/clair,jgsqware/clair