issue 594: Rework unit-test for ApiUtilsSuite

[omordyk]

issue 594: Rework unit-test for ApiUtilsSuite
Description: #594

Changes that were implemented:

• Split ApiUtilsSuite in two tests: TestApiUtilsTime and TestNodeAgbotTokenValidation.
• Extend number of tests for TestApiUtilsTime and TestNodeAgbotTokenValidation.
• Add validation for invalid time format:

  test("ApiTime fixFormatting handles invalid format") {
    val invalidTime = "invalid-time-format"
    info(ApiTime.fixFormatting(invalidTime) + " , " + "Invalid format")
    assert(ApiTime.fixFormatting(invalidTime) == "Invalid format")
  }

[naphelps]

@omordyk Just need to update this branch with master before I can merge.

[omordyk]

@naphelps rebased