[PATCH] newrole auditing of failures due to user actions

This patch introduces two new point in the code where audit records are generated for newrole. Both points are when the attempt to newrole fails. The first point is when the default type could not be determine for the specified role - this is audited because, as sgrubb pointed out, it is currently non-tracked path to probe the policy. The second point is when the desired context to change to is invalid. There record format remains unchanged. Failing to validate the desired context will result in the old and new contexts being recorded intact to the log. For the default type, the old and new contexts have not yet been obtained, so they are recorded in the log as XXX_context=? Signed-off-by: Michael Thompson <thompsmc(a)us.ibm.com&gt; ----