Schematic options jsonschema validation fails because of underscore in parsedArgs

[daiscog]

angular-cli/packages/angular_devkit/schematics_cli/bin/schematics.ts

Line 262 in 2196454

parsedArgs._ = [];

When using "additionalProperties": false in the schema.json for a schematic, validation of arguments fails when invoked via the schematic CLI (in @angular-devkit/schematics-cli@0.1001.4) as it adds an _ property to the options object.

An error occured:
Error: Schematic input does not validate against the Schema: {"_":[], ...}
Errors:
  Data path "" should NOT have additional properties(_).

Earlier versions did not fail as the parsedArgs._ property used to be deleted before invoking the schematic.

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