bug21293: LIFT is not reporting serious conditions correctly

tests added    : no
tests run      : yes
performance    : no change
release note   : none, internal change to testing only

Change-Id: Ia8cf4e3fae460860e2ac42f7384c72f2501d0475
Reviewed-on: https://gerrit.franz.com:9080/2473
Reviewed-by: Ahmon Dancy <dancy@franz.com>
Tested-by: Kevin Layer <layer@franz.com>

dev/class-defs.lisp

@@ -133,7 +133,7 @@ LIFT during a test run.")
   (:default-initargs 
    :test-problem-kind "Error"))
 
-(defclass test-serious-condition (test-error-mixin testsuite-problem-mixin)
+(defclass test-serious-condition (test-error)
   ()
   (:default-initargs 
    :test-problem-kind "Serious condition"))
@@ -143,7 +143,7 @@ LIFT during a test run.")
   (:default-initargs 
    :test-problem-kind "Testsuite error"))
 
-(defclass testsuite-serious-condition (test-error-mixin testsuite-problem-mixin)
+(defclass testsuite-serious-condition (testsuite-error)
   ()
   (:default-initargs 
    :test-problem-kind "Testsuite serious condition"))