Fix unit tests for swift and improve test script

1) swift:
The same default fact is being used in the upstream spec_helper.rb

2) fuel_unit_tests.sh:
Added tty and color spec opts to provide coloreful output in
Jenkins. Also fixed minor output formatting issues in the script.

Change-Id: I31479ddf5f4074ff556760e9c2328944342570ab
Merge "Fix unit tests for swift and improve test script"