Check Service Bug Fix

Changelog:

🐛 Bug Fixes

• Issue #205
  • Old functionality of check_service when the desired service does not exist:
    • Always returned 2
  • New functionality of check_service when the desired service does not exist:
    • When using only --current_state flag, check_service always returns 0
    • When using --current_state and --state flags together, always returns 2
    • If not using --current_state flag, always returns 2

🔍 Internal Changes

• Test case has been updated to reflect this change(#205)
• New test case has been added to reflect this change for when using --current_state and --state with a service that does not exist(#205)

👏 Contributors

• @tk185166