webos-image: mojoservicelauncher=78

:Release Notes:
- This changes the path that run-js-service uses to find roles files for
  devmode-installed services.
- Also, adds an error message when run-js-service is invoked without
  parameters.

:Detailed Notes:
submissions/76..submissions/78
1294308 Fix output when running run-js-service w/o params
565baa7 Add support for devmode-installed services to mojoservicelauncher

:Testing Performed:
Didn't break any existing services, but devmode service has some issues,
so couldn't do an end-to-end test.

:QA Notes:

:Issues Addressed:
[GF-13324] Nodejs must support devmode-installed services with
           roles/service files at /var/palm/ls2-dev/*
[GF-34311] Typing run-js-service without parameters generates confusing
           output
[GF-38794] CCC:  mojoservicelauncher=78

Open-webOS-DCO-1.0-Signed-off-by: Mark Bessey <mark.bessey@lge.com>
Change-Id: If4756136c26e4302a4db304837b87ff4683cb499
Reviewed-on: https://g2g.palm.com/3462
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>