[hlx up] NODE_OPTIONS env variable set to '--inspect' causes console flooding with 'address already in use' msgs

[stefan-guggisberg]

it's a node.js issue: nodejs/node#9435

the problem occurs when the NODE_OPTIONS environment variable is set and includes --inspect or --inspect-brk and the node app spawns a child process.

parcel spawns child processes which inherit the environment variables. as a result when running e.g.

NODE_OPTIONS=--inspect hlx up

the console will be flooded with
Starting inspector on 127.0.0.1:9229 failed: address already in use
messages.

[stefan-guggisberg]

fixed in 892f3ff