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
roomservice deletion: really set default to no deletion

Change-Id: I48932af075770487f9e622389e81ef7bbdaccb04
Merge remote-tracking branch 'pac/pac-4.4' into pac-4.4