getdependencies.py: Recreate roomservice.xml before parsing it

Changes in dependencies cause duplicates to be written,
causing compile time errors.  Delete the entire file and
rewrite it before letting the script run.

PS2: Some of us don't want roomservice deleted
PS3: Set default to no deletion

Change-Id: If1ccc023274e445d9d683954e75fba92986ea839
Merge "getdependencies.py: Recreate roomservice.xml before parsing it" into pac-4.4