Updatecs_scanimage.py to return a summary/count of Vulnerabilities to stdout.

[atul-bhardwaj-sp]

Currently cs_scanimage.py only provide a detailed report of relevant Vulnerabilities. The information in stdout is not intuitive or immediately meaningful to the user. A user generally will want to quickly see the counts of high, critical, low Vulnerabilities. When we use the tool in a CI/CD system we are forced to consume and parse the resultant JSON file and provide a summary. Users outside of the system will not have that luxury without distributing a wrapper to perform this trivial function. It would be good to have the count of Vulnerabilities returned from the script to stdout in a human readable form that is also easily to programmatically parse such as yaml, json, or toml.

It's a priority 3 for us.