clean up inline_scan output

[Btodhunter]

inline_scan script has some output that does not need to be shown all the time. Update the script to only show important output unless the verbose option is specified. Also, make some of the error messages more verbose for easier debugging.

[Btodhunter]

Started this process in this branch - https://github.com/anchore/ci-tools/tree/clean_up_output