Gate output when in json mode

[DocEmmetBrown]

When running a local scan with wraith scanLocalPath --local-paths $HOME/some/random/dir/ --scan-tests --json --signature-path "$HOME/.wraith/signatures", the output was :

Enumerating Paths
{
  properly formed json
}
Webserver:  false

In order to be able to properly deal with the command output with a regular JSON parser, and to not have to pre-process it, It felt interesting to prevent the first and last output lines to be printed when outputting in CSV or JSON format.

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[mattyjones]

@DocEmmetBrown Thanks for this. No idea how I missed it before!