Add missing attributes to ipasudorule.

This patch adds the following attributes to ipasudorule:

    - order
    - sudooption
    - runasuser
    - runasgroup

It also fixes behavior of sudocmd assigned to the the sudorule, with the
adittion of the attributes:

    - allow_sudocmds
    - deny_sudocmds
    - allow_sudocmdgroups
    - deny_sudocmdgroups

README-sudorule and tests have been updated to comply with the changes.