Update task types to current nailgun task schema
Update task types to current nailgun task schema

Added skipped and reboot task types to tasklib schema
to match what is valid for Fuel 7.0 and 8.0. The schemas
are the same for both releases, and as such, they have been
added as new schema types for tasklib.

Change-Id: Iace451be899b7aa10534502a003e2085e0ac16ae
Closes-Bug: #1512639

eayunstack/fuel-library,huntxu/fuel-library,ddepaoli3/fuel-library-dev,stackforge/fuel-library,huntxu/fuel-library,xarses/fuel-library,xarses/fuel-library,ddepaoli3/fuel-library-dev,eayunstack/fuel-library,stackforge/fuel-library,eayunstack/fuel-library,huntxu/fuel-library,stackforge/fuel-library,eayunstack/fuel-library,xarses/fuel-library,xarses/fuel-library,huntxu/fuel-library,ddepaoli3/fuel-library-dev,stackforge/fuel-library,ddepaoli3/fuel-library-dev,huntxu/fuel-library,ddepaoli3/fuel-library-dev,eayunstack/fuel-library