Compact display for non-default params

[camillobruni]

• Only print the key/values that are actually different from the default.
• Change testIterationCountMap and testWorstCaseCountMap to a simple object
• Remove "Disabling resource prefetching" warning as it's now obvious from the params-diff

Before:

% ~/.jsvu/bin/v8 ./cli.js -- web-ssr --no-prefetch
console.warn: Disabling resource prefetching!
console.warn: Using non standard params: {
  "developerMode": false,
  "startAutomatically": false,
  "testList": [
    "web-ssr"
  ],
  "prefetchResources": false,
  "RAMification": false,
  "dumpJSONResults": false,
  "testIterationCountMap": {},
  "testWorstCaseCountMap": {}
}
Starting JetStream3
...

After:

% ~/.jsvu/bin/v8 ./cli.js -- web-ssr --no-prefetch
console.warn: Using non standard params: {
  "testList": [
    "web-ssr"
  ],
  "prefetchResources": false
}
Starting JetStream3
...

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[kmiller68]

Also, looks like jsc CLI is failing. Can you investigate before merging?

[Constellation]

This broke the consistency between multiple tests for "report" parameter. I changed the name back to report for now. c5dac10

[camillobruni]

oops sorry... could you maybe also add an end2end tests for this?