Fixed sphinx ERRORs.

Fixed errors and warnings due to formatting and layout errors
in documentation.
Those errors makes the page be empty or unavailable.
Other layouts/format fixes makes documentation more clear.

Removed rpc/common.py from patch as suggested in code review.

Change-Id: I0fe11f66384f1aa8919bbb3f5cdf5339f0cbdfc6
Partial-Bug:1257725
Wizard UI for Workflow

This BP implements a wizard UI for modal workflow dialog.

implements bp wizard-ui-for-workflow

Change-Id: Ica1a7e085b016417d285eb6355e70836f68ac170
Merge "Wizard UI for Workflow"
Merge "Fixed sphinx ERRORs."