Truclean should not be performed if the sources.csv line doesn't have a sysdef field
TRUST LEVEL 5 MACHINE V800005.*
TRUST LEVEL 5 MACHINE sym-build01.*
TRUST LEVEL 5 MACHINE sym-build02.*
TRUST LEVEL 5 MACHINE lon-engbuild87.*
TRUST LEVEL 5 MACHINE lon-engbuild89.*
TRUST LEVEL 5 MACHINE C100725
TRUST LEVEL 5 MACHINE C100726
TRUST LEVEL 5 MACHINE UK-ARNAUDL.*