refactor(@angular/cli): remove coercion from `packages`  positional configuration
refactor(@angular/cli): remove coercion from `packages`  positional configuration

Configure the `packages` positional argument to be an array instead of using `coerce` method.

geofffilippi/angular-cli,angular/angular-cli,clydin/angular-cli,geofffilippi/angular-cli,geofffilippi/angular-cli,clydin/angular-cli,geofffilippi/angular-cli,angular/angular-cli,angular/angular-cli,clydin/angular-cli,clydin/angular-cli,angular/angular-cli