ksgen/docstring: minor logging change

Change-Id: I2c837747fba926092cae944a9ea5fa50133ccb9d
ksgen/utils: to_list function

Change-Id: Ibd77caabd7c738d9682515b9f5cd0e1246f4e547
ksgen/yaml_utils: adds safe_dump method

Change-Id: I05602f71ffc44d13e134a4e4c414800c080a372f
ksgen/generator: accepts --rules-file

Change-Id: I3895083c34ed5f6c248ea7f09239d7f6838d73bf
ksgen/tests: adds a simple rules file

Change-Id: I635fe6863a1adb00fae4bb2aecffc8dd75cca079