Add number of sites scanned to the end of vuln-scan results

[ewodrich]

As part of the vuln-scan ending summary, suggest including the number of sites scanned, similar to the count-sites subcommand. . Not sure if this is possible but if debug is enabled, it would be nice to have a listing of the sites found at the end as well. Ex.

Found 9 unique vulnerabilities / 9 total vulnerabilities
Scanned 14 WordPress site(s)

Current appearance at end of vuln-scan: