metricsd: Update weave command APIs

Weave has changed some of D-Bus APIs and metrics needs to be updated
accrdingly. Command::Done is replaced with Complete(), Command::Abort
now takes error code and error messages, Command::category is removed
and Command::status is renamed to Command::state

Change-Id: Ifbfd6d852f4a328168e28484d1152a24b8c8b42b