Broken exclude-low and exclude-informational

[elenadimitrova]

By definition --exclude-low should produce the same results as --exclude shadowing-builtin,shadowing-local,calls-loop,reentrancy-benign,timestamp however there is a significant difference in results, see below:

$ slither contracts/ --solc-disable-warnings --exclude-low
INFO:Slither:contracts/CommonAuthority.sol analyzed (330 contracts), 396 result(s) found

vs

slither contracts/ --solc-disable-warnings --exclude shadowing-builtin,shadowing-local,calls-loop,reentrancy-benign,timestamp
INFO:Slither:contracts/CommonAuthority.sol analyzed (330 contracts), 3239 result(s) found

Same is true for exclude-informational results