`causeErrors` property should not be stringified when return in `--response-format-json`

[zFernand0]

Some commands may be stringifying the causeErrors property when the command has the --rfj option specified.

Here are some examples:

• "causeErrors": "{\"rc\":4,\"reason\":9,\"category\":6,\"message\":\"Job submission error. Record length 100 too long for JCL submission, maxlen=80\"}" Found in: https://github.com/zowe/zowe-cli/issues/979
• "causeErrors": "{\"category\":6,\"rc\":8,\"reason\":386400778,\"message\":\"Data set not found.\",\"details\":[\"IKJ56228I DATA SET USERID.NOTHING NOT IN CATALOG OR CATALOG CAN NOT BE ACCESSED \"]}" Found by zowe files download ds userid.nothing --rfj

Expected output:

• "causeErrors": {
    "errno": -111,
    "code": "ECONNREFUSED",
    "syscall": "connect",
    "address": "255.255.255.255", // wrong ip/host
    "port": 1234 // wrong port
  },

  Found by zowe zosmf check status --rfj

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