Pre-save Fuel default settings in all cases

If you open fuelmenu and do not save at all, then
astute.yaml is not created and is empty. One
workaround is to always save a default config before
running fuelmenu.

Change-Id: Iea2521d08629c690ecece5e9a4f1aae34b8f5deb
Closes-Bug: #1314224
Merge "Pre-save Fuel default settings in all cases"