#109 correctly interpret integer arguments for -d and -n

[Steven Noonan]

Please see attached patch. Right now, the presence of '-n' and '-d' arguments is being treated as always having a '1' value. This isn't correct, as the command-line usage shows:

-d, --no-drng=1|0          Do not use drng as a source of random number input
                           (default: 0)

-n, --no-tpm=1|0           Do not use tpm as a source of random number input
                           (default: 0)