Add handling of exit code 100 from timmy.
Add handling of exit code 100 from timmy.

Diagnostic snapshot returns "Timmy: exit code 100" in the case of
insufficient disk space. In the manual docs of timmy such exit code
has more detailed description.

Change-Id: Idb2a3c31d32025e990c981ff5717309a4a536589
Closes-Bug: #1671455

stackforge/fuel-astute,stackforge/fuel-astute